拍品 257
257
A calculator by Léon Bollée, Le Mans, the flat oxidised brass bed with fourteen pairs of columns beneath a sliding carriage of six stacks of ten hinged indices, with addition and subtraction levers at each side --13½in. wide

細節
A calculator by Léon Bollée, Le Mans, the flat oxidised brass bed with fourteen pairs of columns beneath a sliding carriage of six stacks of ten hinged indices, with addition and subtraction levers at each side --13½in. wide

See Illustration

拍品專文

Léon Bollée is credited with the invention of direct method multiplication, 1887 (V. Turner, G.L'E, Nineteenth Century Scientific Instruments, p.285)