Adding machines.- Gonnella (Tito) Descrizione di due macchine aritmetiche per l'addizione, immaginate e costrutte da tito gonella... Premiato all'esposizione universale di Londra del 1851, first edition, 2 folding lithographed plates (some tearing along folds), spotting, original printed pink wrappers, spotted, splitting to spine ends, minor fraying to fore-edge, [Tomash & Williams G57], large 8vo, Florence, Tipografia Calasanziana, March 1859. ⁂ Gonnella presented his calculating machine at the Great Exhibition in London in 1851, where it won the highest medal. His researches were funded by Leopold II, Grand Duke of Tuscany, to whom he gave one of the three calculating machines constructed in 1857. The first machine described here is a dial adder, similar to Pascal's machine, and the other later machine (devised in 1857) is a keyboard single-digit adder or column adder. Examples of both machines survive today, the first in Bonn, the second in Florence.
Adding machines.- Gonnella (Tito) Descrizione di due macchine aritmetiche per l'addizione, immaginate e costrutte da tito gonella... Premiato all'esposizione universale di Londra del 1851, first edition, 2 folding lithographed plates (some tearing along folds), spotting, original printed pink wrappers, spotted, splitting to spine ends, minor fraying to fore-edge, [Tomash & Williams G57], large 8vo, Florence, Tipografia Calasanziana, March 1859. ⁂ Gonnella presented his calculating machine at the Great Exhibition in London in 1851, where it won the highest medal. His researches were funded by Leopold II, Grand Duke of Tuscany, to whom he gave one of the three calculating machines constructed in 1857. The first machine described here is a dial adder, similar to Pascal's machine, and the other later machine (devised in 1857) is a keyboard single-digit adder or column adder. Examples of both machines survive today, the first in Bonn, the second in Florence.
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.jpg "Quelle: Christie's")
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