Historical development of computer III

Computer Science JSS1 First Term


Historical development of computer III

Performance Objectives

The student should be able to:

     1. Name electro-mechanical counting device.

     2. Discuss 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:

1. Speeding clock or calculating clock: In 1623 and 1624, Schickard reported his design and construction of what he referred to as an arithmetical instrument that he has invented but which would later be described as a (calculating clock). The machine was designed to assist in all the four basic functions of arithmetic (addition, subtraction, multiplication, and division). Amongst its uses, Schickard suggested it would help in the laborious task of calculating astronomical tables. The machine could add and subtract six-digit numbers and indicated an overflow of this capacity by ringing a bell. The adding machine in the base was primarily provided to.... View More

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