Calculating Machine – Series No. 1

Before the 20th century, most calculations were done by humans. Early mechanical tools to help humans with digital calculations were called “calculating machines”, by proprietary names, or even as they are now, calculators.

Links to related series:

Typewriter - Series No. 2

Slide Rule - Series No. 3

Radio Tube Series – Series No. 1

Radio Tube Series – Series No. 2