Who was Thomas de Colmar Charles Xavier Thomas de Colmar was a French inventor and entrepreneur renowned for developing, ...

Key Points About the Tate-Layton Machine The Tate-Layton machine was largely based on the work of Thomas de Colmar and other ...

It couldn’t multiply or divide. He then went into the arithmometer, which is arguably the first commercially successful mechanical calculator with four functions. That was around 1821 or so.