Bollee's calculating machine,circa 1905
Numéro d’image : 11895294
| Bollee's calculating machine. Calculating machine designed and built by the French inventor Leon Bollee (1870-1913). Bollee began working on his calculating machines from 1887,and developed three models: the Direct Multiplier,the Calculating Board,and the Arithmographe. They were the first to use direct mechanical multiplication,as opposed to multiplication by continued addition. This model is similar to a design patented in Germany in 1895. Slides or pegs would be set to the numbers (0-9) on the display,and the multiplication mechanism cranked to produce the answer. One of Bollee's calculating machines contained over 3000 moving parts | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / CCI Archives |
| Taille de l’image : | 3225 px × 2760 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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