2.534 Ergebnisse
1923Best.-Nr. 374061923. unknown books
1929Best.-Nr. 374191929. Einstein Albert 1879-1955. Zur einheitlichen Feldtheorie. Offprint from Sitzungsberichten der preussischen Akademie der Wissenschaften 1 1929. 8vo. 8pp. Berlin: Verlag der Akademie der Wissenschaft 1929. 256 x 183 mm. Original printed wrappers slightly soiled and creased. Very good. First Separate Edition. "In 1928 Einstein embarked on a new approach to a unified field theory . . . involving what he called 'distant parallelism'. . . . By early 1929 he had solved the main problems involved in writing down field equations for his unified theory. On the day of official publication of the third of a formidably technical series of nine articles on the theory . . . excited headlines appeared in foreign newspapers throughout the world. . . . In this frenzied unscientific atmosphere Einstein's new theory was hailed in the press as an outstanding scientific advance. Yet Einstein had stated in his article that it was still tentative; and soon he found he had to abandon it Hoffman Einstein pp. 225-26. This paper is included on Shields's list of Einstein's most significant papers; see Albert Einstein Philosopher-Scientist 1949 p. 758. Weil 165. Pais Subtle is the Lord pp. 344-46. . unknown books
1905Best.-Nr. 2895Leipzig: Johann Ambrosius Barth 1905. First edition. original wrappers. Very Good. FIRST PRINTINGS WITH EXTREMELY RARE ORIGINAL WRAPPERS of Einstein's revolutionary papers of 1905 including the first edition of the initial paper on special relativity; three of the most important papers in the history of science. Beautiful clean copies without any institutional stamps. In the first paper "On a Heuristic Viewpoint Concerning the Production and Transformation of Light" published in March "Einstein postulated that light is composed of individual quanta later called photons that in addition to wavelike behaviour demonstrate certain properties unique to particles. In a single stroke he thus revolutionized the theory of light and provided an explanation for among other phenomena the emission of electrons from some solids when struck by light called the photoelectric effect" Britannica. It was for this paper on the photoelectric effect that Einstein was granted the Nobel Prize in physics in 1921. The next paper "On the Motion-Required by the Molecular Kinetic Theory of Heat-of Small Particles Suspended in a Stationary Liquid" published in May provided a theoretical explanation of Brownian motion. It is generally regarded as the first proof that molecules exist. Although the first two papers were of astonishing originality and importance it was the third paper introducing what would be later known as Einstein's special theory of relativity that would make him famous. "Toward the end of June it was all written up and on June 30 receipt of the manuscript was recorded at the editorial office of Annalen in Berlin. The thirty-page article published three months later was titled 'On the Electrodynamics of Moving Bodies'. It was a treatise beyond compare and without precedent one of the greatest scientific achievements in content and one of the most brilliant in style. Of course there were later additions some from Einstein himself and some from others but these were mere addenda to a theory which had appeared before all the world ready and complete valid for all time" Folsing Albert Einstein. Einstein's theory with the premise that "if for all frames of reference the speed of light is constant and if all natural laws are the same then both time and motion are found to be relative to the observer" "involved a complete rethinking of the entire conceptual tradition of modern physics from its beginning" Britannica; Folsing. Weil 6. Weil 8. Weil 9. Grolier/Horblit 26b. Zur Elektrodynamik bewegter Korper in Annalen der Physik Vierte Folge Volume 17 part 10 pp. 891-921; WITH: Über einen die Erzeugung und Verwandlung des Lichtes betreffenden heuristischen Gesichtspunkt ibid part 6 pp. 132-148. WITH: Über die von der molekularkinetischen Theorie der Warme geforderte Bewegung von in ruhenden Flussigkeiten suspendierten Teilchen ibid part 8 pp. 549-560. Leipzig: Johann Ambrosius Barth 1905. Octavo three issues in original wrappers rebacked; three custom boxes. Note: The issues are slightly trimmed indicating that it is likely they were originally bound with the wrappers and then re-assembled. With general title page volume half-title and index included in part 6. Some chipping to exceedingly rare and brittle original wrappers; otherwise fine. Extremely rare in such outstanding condition. Johann Ambrosius Barth books
1922Best.-Nr. 374051922. unknown books
1930Best.-Nr. 433141930. Offprint from Sitzungsberichte der preussischen Akademie der Wissenschaften 1930. Single sheet pp. 1-2. 256 x 184 mm. Upper edge a bit creased light toning but very good. First edition offprint issue. One of Einstein's last papers on Riemann metrics and distant parallelism written the year before he abandonded this approach to constructing a unified field theory. Pais Subtle is the Lord p. 347. Weil Albert Einstein Bibliography 173. unknown books
1930Best.-Nr. 37422Berlin: Akad. Wiss 1930. Weil 170. Offprint from S. preuss. Akad. Wiss. Akad. Wiss unknown books
1917Best.-Nr. 19286Leipzig: S. Hirzel 1917. FIRST EDITION. Contemporary half cloth and marbled boards preserved in a morocco slipcase. An excellent clean copy. First edition of this classic work on the quantum theory of radiation by Einstein in which he predicts the existence of the phenomenon of stimulated emission of radiation. He here analyzes the properties of photons and demonsrtrtes that Planck’s law is directly deducible from quantum theory and the concept of transition probabilities. Four decades later MASER and LASER devices are operated to prove him right. Boni 95; Weil 91. S. Hirzel unknown books
1908Best.-Nr. 2507Leipzig: S. Hirzel 1908. First edition. original wrappers. Very Good. THE BIRTH OF GENERAL RELATIVITY: FIRST PRINTING IN RARE ORIGINAL WRAPPERS OF ONE ONE EINSTEIN'S MOST IMPORTANT PAPERS; containing the beginning of general relativity the derivations of the equivalence principle gravitational redshift and the gravitational bending of light. "Einstein's road to general relativity began in November 1907 when he was struggling against a deadline to finish an article for a science yearbook explaining his special theory of relativity. Two limitations of that theory still bothered him: it applied only to uniform constant-velocity motion. and it did not incorporate Newton's theory of gravity. "'I was sitting in a chair in the patent office at Bern when all of a sudden a thought occurred to me' he recalled. 'If a person falls freely he will not feel his own weight.' That realization which 'startled' him launched him on an arduous eight-year effort to generalize his special theory of relativity and 'impelled me toward a theory of gravitation.' Later he would call it 'the happiest though in my life.' "The tale of the falling man has become an iconic one and in some accounts it actually involves a painter who fell from the roof of an apartment building near the patent office. Einstein refined his thought experiment so that the falling man was in an enclosed chamber such as an elevator in free fall above the earth. In this falling chamber at least until it crashed the man would feel weightless. Any objects he emptied from his pocket and let loose would float alongside him. "Looking at it another way Einstein imagined a man in an enclosed chamber floating in deep space 'far removed from stars and other appreciable masses.' He would experience the same perceptions of weightlessness. 'Gravitation naturally does not exist for this observer. He must fasten himself with strings to the floor otherwise the slightest impact against the floor will cause him to rise slowly towards the ceiling.' "Then Einstein imagined that a rope was hooked onto the roof of the chamber and pulled up with a constant force. 'The chamber together with the observer then begin to move "upwards" with a uniformly accelerated motion.' The man inside will feel himself pressed to the floor. 'He is then standing in the chest in exactly the same way as anyone stands in a room of a house on our earth. The man in the chamber will come to the conclusion that he and the chest are in a gravitational field. Just then however he discovers the hook in the middle of the lid of the chest and the rope which is attached to it and he consequently comes to the conclusion that the chamber is suspended at rest in the gravitational field.' Einstein observed that inertial mass always equals gravitational mass and through his thought experiments concluded that "From this correspondence it follows that it is impossible to discover by experiment whether a given system of coordinates is accelerated or whether. the observed effects are due to a gravitational field." "Einstein called this 'the equivalence principle.' The local effects of gravity and of acceleration are equivalent. "In 1907 working against the deadline imposed by the Yearbook of Radioactivity and Electronics Einstein tacked on a fifth section to his article on relativity that sketched out his new ideas. He also came up with many predictions that could be tested including that light should be bent by gravity and that the wavelength of light emitted from a source with a large mass such as the sun should increase slightly in what has become known as the gravitational redshift. "It would take Einstein another eight years until November 1915 to work out the fundamentals of this theory and find the math to express it. Then it would take another four years before the most vivid of his predictions the extent to which gravity would bend light was verified by dramatic observations. But at least Einstein now had a vision one that started him on the road toward one of the most elegant and impressive achievements in the history of physics: the general theory of relativity" Isaacson Einstein 145-49. Weil in his bibliography also notes that "On p.443 are probably the first explicit statements both of the equivalence of inertial and gravitational mass and of the equation for mass in terms of energy now regarded as the theoretical basis for the release of atomic energy." Weil 21. Although Einstein submitted the paper on 4 December 1907 it wasn't published until the January 22 issue of the Jarbuch. Note: There was a very short "Correction" in a subsequent issue not included here. IN: Jahrbuch der Radioactivität under Electronik Vierter Band - 4. Heft No. 16 pp. 411-462. Leipzig: S. Hirzel 1908. Octavo original wrappers; handsome custom box. Light wear to wrappers and split to spine; text fine with Einstein paper largely unopened. AN EXTREMELY RARE COPY IN ORIGINAL WRAPPERS OF ONE OF EINSTEIN'S MOST IMPORTANT PAPERS. S. Hirzel unknown books
1911Best.-Nr. 50424Leipzig: Johann Ambrosius Barth 1911. The Genesis of General Relativity Einstein Albert 1879-1955. 1 Elementare betrachtungen über die thermische molekularbewengung in festen Körpern. In Annalen der Physik 35 9: 679-94 pp. Weil 42. 2 Über den Einfluß der Schwerkraft auf die Ausbreitung des lichtes. In Annalen der Physik 35 10: 898-908 pp. Weil 43. Red cloth gilt spine lettering. Figs. Text-illust. 214 x 140 mm. Whole volume: viii 1040 pp. 6 plates 3 b/w silver photos 1 colorized 2 folding. Very good. Approximate English translations of titles: 1 "Elementary considerations about thermal molecular motion in solid bodies" and 2 "On the influence of gravity on the propagation of light." "Einstein returns to his thoughts on gravitation and discusses his ideas on the static gravitational field no. 1 above advancing the "half-shift" prediction of the deflection of light by a massive body such as the Sun. In his early papers on the subject . . . he used two important features: the principle of equivalence and the role of the speed of light. In this paper he takes a broader perspective saying that if a light beam is bent in an accelerating frame of reference then if the theory is correct it must also be besnt by gravity by exactly the equivalent amount." Calaprice An Einstein Encyclopedia. "An important conclusion of this paper is that the velocity of light in a gravitational field is a function of the place. The equation: c = c01 / c2 signifies that there exists a relationship between the velocity of light and the gravitational potential; the latter influences the first." Weinstein Einstein's 1912-1913 struggles with Gravitation Theory: Importance of Static Gravitational Fields Theory. "Here no. 2 above Einstein continues the work he had begun in 1907 on the specific heat of solids where the heat agitation of solids was reduced to a monochromatic oscillation of the atom and the specific heat was determined based on the quantum treatment of an oscillator in a radiation field. He explains the discrepencies between his formula and the measurements at low temperatures" Calaprice An Einstein Encyclopedia. Weil's Einstein Bibliography nos. 42 and 43. Boni's Einstein Checklist nos. 38 39. . Johann Ambrosius Barth unknown books
1907Best.-Nr. 50420Leipzig: Johann Ambrosius Barth 1907. Einstein explicitly establishes E=mc2. Einstein Albert 1879-1955. 1 Über die Möglichkeit einer neuen Prüfung des Relativitätsprinzips. In Annalen der Physik 23 6: pp. 197-8. 2 Bemerkungen zu der Notiz von Hrn. Paul Ehrenfest: "Die translation deformierbarer Elektronen und der Flächensatz." In Annalen der Physik 23 6: pp. 206-8. 3 Über die vom relativitätsprinzip geforderte Trägheit der Energie. In Annalen der Physik 23 7: pp. 371-384. 8vo. Red cloth gilt lettering on spine. 214 x 140 mm. Whole volume: viii 1000 pp. 4 plates numbered Taf. I - IV. Tafs. I II and IV are folding Taf. III is b/w silver photograph tipped to sheet. Foot of the spine is repaired. Very good. Approximate English translations of titles: 1 "On the possibility of a new test of the principle of relativity." 2 "Remarks on Mr. Paul Ehrenfest's note: 'The translation of deformable electrons and the surface theorem.'" 3 "On the inertia of energy required by the principle of relativity." In "On the inertia of energy required by the relativity principle" May 1907 "Using rather than m V rather than c and 0 rather than E0 Einstein wrote his famous equation for the first time as V2= 0 and he did it in a footnote. At the end of that paper he introduced the symbol E0 to denote energy in the rest frame and wrote the famous expression again this time as =E0/V2." -Eugene Hecht How Einstein confirmed E0 = mc2 In the third paper Einstein explicitly establishes his famous equation E=mc2 although with different symbols. In this paper Einstein discussed the relationship between inertial mass and energy arguing for their complete equivalence namely that every mass has an equivalent energy just as every form of energy has an equivalent mass. This relation says that a photon can convert for the equivalence of mass and energy his celebrated equation E = mc2 Calaprice The Einstein Almanac. Weil's Einstein Bibliography nos. 17 18 and 19 respectively. Boni's Einstein Checklist nos. 17 18 and 19 respectively. . Johann Ambrosius Barth unknown books
1917Best.-Nr. 6547Braunschweig: Friedrich Vieweg 1917. Ninth printing. Acceptable. 23 cm; iv. 79 pages. Three figures in text along with numerous equations. In original printed wraps. Acceptable only with paper peeling from the spine and sewing tender. Paper cover is completely detached in front and hanging by a thread in back. The pages are yellowed. There is an ownership autograph of one E. Bodländer. That said a clean unmarked copy in original state. The original German edition of Einstein's epoch-making "On the Special and General Theory of Relativity. Friedrich Vieweg paperback books
1921Best.-Nr. 433161921. Offprint from Sitzungsberichte der preussischen Akademie der Wissenschaften 1921. Single sheet pp. 882-883. 256 x 184 mm. Minor marginal tears one corner chipped but very good. First ediiton offprint issue. "Since after 1917 Einstein firmly believed that light-quanta were here to stay it is not surprising that he would look for new ways in which the existence of photons might lead to observable devations from the classical picture. In this he did not succeed. At one point in 1921 he thought he had found a new quantum criterion published in the present paper but it soon turned out to be a false lead" Pais Subtle is the Lord pp. 412-413. Weil Albert Einstein Bibliography 118. unknown books
1906Best.-Nr. 432891906. Einstein Albert 1879-1955. Über eine Methode zur Bestimmung des Verhältnisses der transversalen und longitudinalen Masse des Elektrons. Offprint from Annalen der Physik 21 1906. 583-586pp. 223 x 145 mm. Original printed wrappers chipped spine splitting minor spotting. Light toning but very good. First Edition Rare Offprint Issue. In his landmark 1905 paper on special relativity Einstein used the velocity-dependent concepts of transverse and longitudinal mass for the moving electron these terms have now been replaced with the concept of relativistic mass first defined by Lewis and Tolman in 1909. In the present paper Einstein proposed an experimental method for determining the ratio of the transverse to the longitudinal mass and invited experimentalists to verify his special theory of relativity. Einstein later abandoned velocity-dependent mass concepts stating in 1948 that "it is better to introduce no other mass concept than the 'rest mass' m" quoted in L. B. Okun "The concept of mass" Physics Today 1989: 31-36. Lavenda A New Perspective on Relativity pp. 7-8. Weil Albert Einstein Bibliography 14. . unknown books
1910Best.-Nr. 50336Leipzig: Johann Ambrosius Barth 1910. Einstein Albert 1879-1955. 1 Uber einen Satz der Wahrscheinlichkeitsrechnung und seine Anwendung in der Strahlungstheorie with L. Hopf. pp. 1096-1104. Weil 34 Boni 29. 2 Statistiche Untersuchung der Bewegung eines Resonators in einem Strahlungsfeld with L. Hopf. pp. 1105-1115. Weil 35 Boni 30. 3 Theorie der Opaleszens von homogenen Flüssigkeiten und Flüssigkeitsgemischen in der Nähe des kritischen Zustandes. pp. 1275-1298. Weil 36. In Annalen der Physik und Chemie 33. Red cloth with gilt lettering on the spine. Whole volume: viii 1584 pp. 6 plates. Text-figs. 210 x 130 mm. Very good copy. Approximate English translations of titles and brief explanations of papers: 1 "On a theorem of probability calculus and its application in the radiation theory." "Einstein and Hopf wrote this paper to show that the failure of statistical mechanics vis-a-vis the radiation law cannot be ameliorated by proposing that individual statistical events in the emission of light from different points on the surface of a luminous body are not actually independent but instead are interdependent with each other. Even if one assumes a failure to be statistically independent one derives the same usual form of the radiation law as Fourier sum." p. 290. Calaprice Kennefick & Shulmann. An Einstein Encyclopedia. 2015. 2 "Statistical investigation of the movement of a resonator in a radiation field." With: L. Hopf. "The authors make use of the results in no. 1 above demonstrating that the Rayleigh-Jeans law of radiation is an unavoidable consequence of statistics even if we avoid assumptions that we may think need correction. In other words we cannot blame statistics for a faulty result." p. 290. Calaprice Kennefick & Shulmann. An Einstein Encyclopedia. 2015. 3 "Theory of the opalescence of homogenous liquids and liquid mixtures near the critical state"."Einstein explains the optical effects that occur near the critical point of a fluid at which liquid gas phases can coexist and of a binary mixture of liquids that can also explain the blue color of the sky. It adds to earlier stuidies that provided evidence for the atomistic constitution of matter and is one of the most difficult papers to understand." p. 290. Calaprice Kennefick & Shulmann. An Einstein Encyclopedia. 2015. "October 1910. E. completes a paper on critical opalescence his last major work in classical statistical physics." Pais Subtle is the Lord. 523. Weil's Einstein Bibliography nos. 34 35 and 36 respectively. Boni's Einstein Checklist nos. 29 30 and 31 respectively. . Johann Ambrosius Barth unknown books
1916Best.-Nr. 50341Leipzig: Johann Ambrosius Barth 1916. Einstein Albert 1879-1955. Über Friedrich Kottlers Abhandlung "Über Einsteins Äquivalenzhypothese und die Gravitation." In Annalen der Physik 51 638-642 pp. Red cloth with gilt lettering on the spine. Whole volume: 883 pp. 4 plates. Figs. Text-illust. 210 x 130 mm. A very good copy. Weil's Einstein Bibliography no. 81. Boni's Einstein Checklist no. 79. . Johann Ambrosius Barth unknown books
1929Best.-Nr. 19299Berlin: Verlag der Akademia der Wissenschaften in Kommission bei Walter de Gruyter 1929. FIRST EDITION. Original printed orange wrappers; a fine copy unopened and bound into morocco-backed cloth boards spine labeled in gilt. First edition first issue in the rare author’s offprint form with a newly set title-page. One of Einstein’s last important scientific works this publication of the unified field theory caused quite a sensation. It was the first separate printing of one of a series of five papers published between 1925 and 1929 in which Einstein attempted to develop a unified field theory reconciling in a single formula the laws of electromagnetism and gravitation. Weil 165; Printing & the Mind of Man 418. Verlag der Akademia der Wissenschaften in Kommission bei Walter de Gruyter unknown books
1915Best.-Nr. 14657Leipzig and Berlin: B.G. Teubner 1915. With frontispiece portrait of Minkowski and text figures. Boards spine and corners frayed and cracking. Sammelband containing the original papers on the special and general theories of relativity with a foreword by O. Blumenthal. It is in Minkowski's famous paper Raum und Zeit Space and time that he proposes the concept of time as the fourth dimension and initiates a mathematical study that became the basis of the later development of the theory. Included here is the re-issue of that work by Einstein and Lorentz with notes by A. Sommerfeld published after Minkowski's untimely death along with other papers by the two scientists whose works led to the abandonment of space and time as separate entities. Weil 59; see Printing & the Mind of Man 401. B.G. Teubner unknown books
1954Best.-Nr. 195551954. in German black ink. Signed “A. Einstein”. A poem written by Einstein to his colleague and collaborator Ernst Straus and his son Daniel. “Dear Strausse both! My best wishes and greetings in poetic form. It brings even more happiness If it has been anticipated for so long also in one’s circle of friends the event is doubly appreciated. This is what I wish: Let Daniel be like his father thoroughly intelligent and not less joyous so few humans are like that. Many - alas - are born few are chosen to bring light and joy. Let such gift be his drive. Yours A. Einstein” In German “Strauss” means bunch bouquet etc. or ostrich and “Strausse” is plural. Ernst G. Straus 1922-1983 was a mathematician who helped found the theories of Euclidean Ramsey theory and of the arithmetic properties of analytic functions. He was Einstein’s assistant and collaborator both at Princeton and afterwards when he moved to become a professor of mathematics at UCLA. His son Daniel is a professor of chemistry at Cal State San Jose. unknown books
1921Best.-Nr. 18099New York: Henry Holt and Company 1921. THIRD EDITION. With frontispiece portrait Einstein dated 1920. Blue cloth small tear at top of spine corners slightly worn no dust wrapper; front hinge a bit loose otherwise a very clean copy. From the library of Martin J. Klein professor of the history of science at Yale and the first recipient of the Abraham Pais Prize for the History of Physics. This copy was given to Klein as a gift from his summer program NEH class of 1986 and is signed by 13 of his students. Third edition though the only change is the date on the title page of one of Einstein’s most renowned works intended for readers with a general scientific and philosophical background. Part I treats the special theory of relativity part II the general theory and part III considers the universe as a whole. Not in Weil or Boni. Henry Holt and Company unknown books
1958Best.-Nr. 188282New York: Dover 1958. Near Fine. Reprint. Near fine. Dover unknown books
1918Best.-Nr. 005931Leipzig: Johann Ambrosius Barth 1918. Contemporary half cloth boards. Joints repaired slightly worn; book plate; ink stamp on front flyleaf and title. First Edition. About Very Good. Johann Ambrosius Barth hardcover
Best.-Nr. H1017Leipzig J. A. Barth 1906 S. 371-381. Halbleinenband der Zeit mit goldgeprägtem Rückentitel gr. 8°. Vorderdeckel etwas berieben.2 St. a. Titel. Text sauber und frisch. bedeutender Botaniker und Nachfolger Dryanders als Bibliothekar Joseph Banks' ist noch heute durch seine Entdeckung der sog. Brownschen Bewegung auch Brownschen Molekularbewegung Brownian Movement im Jahr 1827 bekannt. Bei Beobachtungen mit dem Mikroskop fiel ihm die unregelmäßige Zitterbewegung von auf der Wasserfläche dahintreibenden Blütenstaubpartikeln auf. Brown konnte keine Erklärung dafür finden. Es war Albert Einstein der 1905 herausfand dass sie durch Zusammenstöße mit unter dem Mikroskop nicht sichtbaren Atomen und Molekülen herrührt. Einstein veröffentlichte seine Beobachtung in den Abhandlungen "Über die von der molekularkinetischen Theorie der Wärme geforderte Bewegung von in ruhenden Flüssigkeiten suspendierten Teilchen" Annalen der Physik 4. Folge Bd. 17 1905 und – hier vorliegend - "Zur Theorie der Brownschen Bewegung" dass. Bd. 19 1906. Die erfolgreiche Erklärung der brownschen Bewegung gilt als Meilenstein auf dem Weg zum wissenschaftlichen Nachweis der Existenz der Moleküle und damit der Atome. Robert Brown 1773-1858 zählte zu den bedeutendsten Botanikern der ersten Hälfte des 19. Jahrhunderts. Nach dem Studium der Medizin und Botanik in Edinburgh wurde er zunächst als Militärarzt im Norden Irlands tätig. 1798 machte er die Bekanntschaft von Joseph Banks – ein Treffen das entscheidend für sein ganzes weiteres Leben sein sollte. Banks bot ihm eine Stelle als Naturwissenschaftler auf Flinders Expedition zur Erforschung der australischen Küsten an. Brown nahm an und arbeitete in der Folge eng mit dem Pflanzenmaler Ferdinand Bauer zusammen. Als Flinders aufgrund des untragbaren Zustandes des Expeditionsschiffs "Investigator" gezwungen war die Reise vorzeitig abzubrechen blieben Brown und Bauer in Port Jackson zurück um ihre Forschungen bis zur Rückkehr Flinders' fortzuführen. Brown ging in der Folge nach Van Diemens-Land Tasmanien Bauer auf die Norfolk-Insel. 1805 traf man sich in Sydney wieder und trat die Heimreise an. Kurz nach seiner Rückkehr wurde Brown zum Bibliothekar der Linnéan Society. 1810 nach dem Tod Dryanders übernahm er dessen Stelle in der Bibliothek Banks'. Letzterer gab Brown testamentarisch das Recht auf lebenslange Nutzung seiner Sammlungen und seiner Bibliothek. Als man diese 1827 ins British Museum verlegte wurde Brown zum Bibliothekar und Kurator der dortigen botanischen Abteilung. Nach Banks' Tod gab Brown seine Stellung als Bibliothekar der Linnéan Society auf und fungierte von 1849 bis 1853 als deren Präsident. Bereits 1839 hatte man ihm für seine Forschungen über den pflanzlichen Befruchtungsprozess die Copley-Medaille verliehen. unknown
1916Best.-Nr. 6164Braunschweig: Druck und Verlag von Friedr. Vieweg and Son 1916. First edition. First edition complete journal issue in original printed wrappers inscribed by Einstein to fellow Nobel Laureate Walther Bothe. "This work represents a major step forward in quantum theory" Calaprice p. 297. It introduced the concept of stimulated emission of radiation the theoretical basis for the laser; it also contained a new derivation of Planck's radiation law which provided as a by-product a justification of the frequency rule forming the basis of Bohr's theory of atomic spectra. . DISCOVERY OF STIMULATED EMISSION OF RADIATION THE PRINCIPLE OF THE LASER INSCRIBED BY EINSTEIN TO A FELLOW NOBEL LAUREATE. First edition complete journal issue in original printed wrappers inscribed by Einstein to fellow Nobel Laureate Walther Bothe. "This work represents a major step forward in quantum theory" Calaprice p. 297. It introduced the concept of stimulated emission of radiation the theoretical basis for the laser; it also contained a new derivation of Planck's radiation law which provided as a by-product a justification of the frequency rule forming the basis of Bohr's theory of atomic spectra. "According to Albert Einstein when more atoms occupy a higher energy state than a lower one under normal temperature equilibrium it is possible to force atoms to return to an unexcited state by stimulating them with the same energy as would be emitted naturally" Britannica. This is 'stimulated emission.' "To claim that Einstein almost invented the laser would be an exaggeration but the laser's underlying mechanism stimulated emission of radiation was a creation of his radiation theory" Kleppner pp. 32-33. "During the summer of 1916 less than a year after he had completed the general theory of relativity Einstein made a new major contribution to the quantum theory. The two papers he wrote then deal with the quantum theory of radiation by arguments that do not depend on the classical electromagnetic theory as had all earlier treatments of Planck's radiation law . When Einstein returned to the radiation problem in 1916 the quantum theory had undergone a major change. Niels Bohr's papers had opened a new and fertile domain for the application of quantum concepts - the explanation of atomic structure and atomic spectra. In addition Bohr's work and its generalizations by Arnold Sommerfeld and others constituted a fresh approach to the foundations of the quantum theory of matter" DSB. In this paper "Einstein considers a system of atoms in equilibrium with an external radiation field. An atom can change its internal energy state by absorbing or emitting radiation. Einstein introduces three basic assumptions about these exchanges of energy between matter and field. First the probability of absorption of radiation is proportional to the radiation density. Second there are two kinds of emission processes: one - spontaneous - following a law like that of radioactive decay; the other - stimulated - induced by the radiation field and with probability proportional to the radiation density. Third at equilibrium the atoms are distributed among their internal states according to the Boltzmann distribution law. From these assumptions Planck's law follows in a simple way. Einstein was very pleased with his derivation which he characterized in a letter to Besso: 'An amazingly simple derivation of Planck's formula I should like to say the derivation.' As a bonus from his derivation Einstein found that the energy difference between two internal energy states of the atom had to be equal to hv with v the frequency of the radiation absorbed or emitted in transitions between these two states thus confirming one of the postulates of Niels Bohr's theory of spectra" Papers 6 xxiii-xxiv. "Einstein meant the second part of this study a proof of the oriented character of the emission process to be his most essential contribution to quantum radiation theory this second paper was published later in 1916 as 'Zür Quantentheorie der Strahlung'. Instead Bohr gave more importance to the new deduction of the blackbody law; for this deduction reinforced the basic assumptions of his atomic theory and completed them with a statistical description of radiation processes" Darrigol p. 120. Provenance: Inscribed by Einstein on front wrapper "für. Dr Bothe" i.e. Walther Bothe 1891-1957. "In 1929 in collaboration with W. Kolhörster Bothe introduced a new method for the study of cosmic and ultraviolet rays by passing them through suitably arranged Geiger counters and by this method demonstrated the presence of penetrating charged particles in the rays and defined the paths of individual rays. For his discovery of the 'method of coincidence' and the discoveries subsequently made by it which laid the foundations of nuclear spectroscopy Bothe was awarded jointly with Max Born the Nobel Prize in Physics 1954" . While Einstein commended Planck's epoch-making derivation of his radiation law in 1900 which ushered in the quantum era he had also noted its limitations. Einstein also saw inconsistencies in Planck's derivation of his law. For Einstein this inconsistency was no reason to reject Planck's quantum theory but it was a reason to study the foundations of traditional radiation theory and if needed revise them. "As Einstein had noted in 1906 Planck's derivation of the Rayleigh-Jeans law uν = 8πν2/c3 kT between average resonator energy uν and radiation spectrum ν only applied to classical resonators T is the temperature k is Boltzmann's constant. A new quantum-theoretical picture of the interaction between matter and radiation was needed. Einstein found it in the summer of 1916 after the completion of his general theory of gravitation left him more time for quantum meditation. "The new picture presumably emerged from a combination of three elements: Einstein's derivation of the law of photochemical equivalence his analogy between quantum states and chemical species and Niels Bohr's theory of atomic spectra. According to Bohr atoms and molecules can only exist in a series of quantum states S0 S1 . . . Sn . . . with well-defined energies E0 E1 . . . En . . . Their interaction with radiation occurs through quantum jumps with characteristic values of the frequency of the emitted or absorbed radiation. Regarding the quantum states as chemical species and remembering his photochemical reasoning Einstein knew that he could derive Wien's law by balancing the absorption process Sn hν → Sn1 with the emission process Sn1 → Sn hν and by making the probability of the first reaction proportional to the density of radiation at frequency ν. Something in this reasoning needed to be altered in order to get Planck's law instead of Wien's. "At this point Einstein appealed to an analogy between classical and quantum theory. According to classical theory an oscillating dipole spontaneously emits radiation whether or not radiation is initially present in its surroundings. When external radiation encounters this dipole it may either be absorbed if the phase of the incoming wave agrees with that of the oscillator or it may be amplified in the contrary case. In the quantum theory of radiation Einstein similarly admitted the existence of three kinds of processes: spontaneous emission Ausstrahlung absorption negative Einstrahlung and stimulated emission positive Einstrahlung. The modern terminology is Bohr's. For the probability per time unit of the respective sorts of quantum jump Einstein assumed the forms Anm ÏνBnm ÏνBmn where n is the upper quantum state m the lower one and Ïν is the density of radiation at the frequency ν. "Einstein did not say much on the nature of the probabilities he thus introduced. He only commented that his theory had the weakness to leave to chance the instant and direction of the spontaneous emission of light. He also noted the similarity between spontaneous emission and radioactive decay. Undoubtedly he would have preferred a theory in which the emission and absorption probabilities were deduced from an underlying deterministic theory. He nonetheless expressed his 'full trust in the present way of reasoning'. The probabilistic description of the interaction was a natural counterpart of the discrete character of quantum states: if a quantum system evolves mostly through quantum jumps then the probability of a quantum jump obviously is the main quantity of physical interest. Instead of speculating on the precise timing and fine structure of the jumps Einstein proceeded to show what could be done by means of the new probability coefficients. "At thermal equilibrium Einstein reasoned statistical mechanics requires the number of atoms in a quantum state n to be proportional to exp−En /kT. The kinetic equilibrium between the atoms and surrounding radiation further requires that the number of quantum jumps from m to n should be equal to the number of reverse jumps: ÏνBnm exp−Em /kT = ÏνBnm Anm exp−En /kT. In the high temperature limit for which Ïν → ∞ this condition gives Bnm = Bmn. Therefore the equilibrium value uν of the density Ïν is given by uνexpEn − Em/kT - 1 = Anm / Bnm. According to a thermodynamic theorem by Wien uν/ν3 must be a function of ν/T only. Hence En − Em must be proportional to ν. Einstein thus derived Bohr's strange frequency rule ΔE = hν with complete generality and without recourse to any of the empirical laws of spectra. He then required the expression of uν to agree with the Rayleigh-Jeans law in the low-frequency limit. The outcome was Planck's law as well as the relation Anm / Bnm = 8πhν3/c3 between Einstein's two probability coefficients . "Einstein's new theory of radiation is now remembered for the introduction of stimulated emission which famously permitted the conception of masers and lasers. For Einstein and for his contemporaries the importance of these memoirs lay elsewhere. First Einstein filled an important gap in the derivation of Planck's law by means of a simple statistical description of radiation processes. Second he corroborated two basic assumptions of Bohr's atomic theory: the existence of stationary states and the frequency rule. In this regard it should be emphasized that before Einstein's and Sommerfeld's contributions of 1916 Bohr believed that his frequency rule only applied to strictly periodic systems. For instance he regarded the Zeeman effect as a violation of this rule. Einstein's new considerations established its complete generality" Darrigol in Cambridge Companion to Einstein pp. 134-136. "The implication of Einstein's theory of stimulated emission was that if one arranges for a large number of atoms to be in identical excited states a stray photon of the right energy can stimulate one atom to emit another photon which stimulates another. and all the atoms release their excess energy in a sudden cascade. What's more the photon released by stimulated emission will be in phase - coherent - with the one that stimulated it and so all the light produced in the cascade will be coherent. "In 1955 American physicist Charles Townes of Columbia University in New York an expert in molecular spectroscopy and his co-workers showed how stimulated emission could be used to make a device for generating or amplifying microwaves which they called a maser microwave amplified stimulated emission of radiation. Three years later Townes and Arthur Schawlow explained how to extend the idea to visible and infrared frequencies to make an 'optical maser' - in effect the laser. "They proposed using ordinary incoherent light to pump atoms into an excited state setting up the 'population inversion' in which the atoms are primed to return to their ground state by emitting photons. And their design used an optical cavity - basically two mirrors between which photons would bounce - to trap the emitted photons while they stimulated more emission. The device they explained would generate 'extremely monochromatic single-wavelength and coherent light'. Theodore Maiman of the Hughes Research Laboratories in Malibu California described such a device using a ruby crystal already used for masers as the lasing medium in 1960" 'A century ago Einstein sparked the notion of the laser' Physics World History Blog 31 August 2017. Weil 85. Calaprice An Einstein Encyclopedia 2015. Darrigol From c-numbers to q-numbers 1992. Kleppner 'Rereading Einstein on radiation' Physics Today 58 2005 pp. 30-33. Pais Subtle is the Lord 1982. 8vo 228 x 154 mm pp. 315-332. Original printed wrappers. A fine copy. Druck und Verlag von Friedr. Vieweg and Son unknown
Best.-Nr. H4002Berlin Akademie der Wissenschaften 1932 In: Sitzungsberichte der Königl.Preuss. Akademie der Wissenschaften Band 1932. 4to. S.130-137 und 522-550. Weiters: Hahn Otto: Radioaktivität und ihre Bedeutung für Fragen der Geochemie. S.2-17. Schrödinger Erwin: Diracsches Elektron im Schwerefeld I. S.105-129. Weiteres von Planck Halbleinenband der Zeit leicht berieben Bibl.-Nr.am Rücken Original-Broschur miteingebunden unaufgeschnitten gutes Exemplar. unknown
Best.-Nr. H3997Berlin Akademie der Wissenschaften 1924-1925 In: Sitzungsberichte der Königl.Preuss. Akademie der Wissenschaften 2 Bände 1924 und 1925. 4to. S.261-267; S.3-25; S.414-419. Anbei u.a.: Schrödinger E.: Über die statistische Entropiedefinition beim idealen Gas. S.434-441; Planck Max: Zur Frage der Quantelung einatomiger Gase. S.49-56. Halbleinenband der Zeit leicht berieben Bibl.-Nr.am Rücken Original-Broschur miteingebunden unaufgeschnitten gutes Exemplar. unknown