Electro-mechanical Counting Devices

Electro-mechanical Counting Devices These are counting devices that could be operated both electrically and mechanically. Electro-mechanical devices include the following: Speeding Clock Blaise Pascal machine Gottfried Leibniz Machine   SPEEDING CLOCK OR CALCULATING CLOCK In 1623 and 1624, reported his design and construction of what he referred to as an arithmetical instrument that he has