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1926ref. 26073Spoleto: L Pianciani 1926. First only Edition. As issued. Very good; some minor wear to the envelope; toning. 12mo pamphlet single folded sheet 4 pp. together with printed table on pink cardboard containing five removable concertina tabs 115 x 137mm. Appealing portable calculating device inspired by Napiers bones the wooden or bone rods here replaced with five printed and pleated paper sheets which have been inserted into a pink card table numbered 1to 9. Professor Pietro Mori was according to contemporary records Director of the Luigi Pianciani Royal Complementary School and the printed envelope reveals that the device was being sold in aid of the school. No other copies located. L Pianciani books