Marchant ACT10M Adding Machine
| Home > Browse Our Collection > Calculators > Electro Mechanical > Marchant ACT10M Adding Machine |
|
The Marchant ACT10M is an early example of a fully-automatic proportional gear calculator. Harold Avery, the head of engineering at Marchant, invented the "Silent Speed' proportional gear mechanism which first appeared in 1932. It was based on a continuous-drive mechanism which used proportional and differential gears. At the time, it was the fastest and quietest machine of its kind. Marchant would go on to use the mechanism for the next 30 years. The ACT10M was the first to introduce an automatic multiplier with the column of black numbers on the right side of the keyboard. Manufacturer: Marchant Other Systems Related To Marchant ACT10M Adding Machine:
This exhibit has a reference ID of CH42451. Please quote this reference ID in any communication with the Centre for Computing History. |
Related Video
|
