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Slide Rule
William Oughtred invented the slide rule. it was used for mutiplcation and division. -
Mechanical Calculator
Blaise pascal invented. It was used for basic arithmetic. They are mainly desktop calculators. -
Adding and Subtracting Calculator
Samule invented a calculator that can add and subtract. -
Binary Mathmatics
Leibniz inveted binary mathmatics. It represents text or computer processor instructions using the binary number system's two binary digits, 0 and 1. -
Europian Telegraph
The Europians were the first to invent the telegraph. It was first in the form of semaphore lines. It was used to send messages to a distant observer through line-of-sight sgnals. -
Difference Engine
Charles Babbage started the work of the Difference engine. It was an automatice mechcanical calculator. It was desinged to tabulate polynomial functions. -
American telegraph
Samual F. B. Morse conducted the first successful with the first telegraph. It was used encode messgaes. -
printing calculator
George Scheutz invted the printing calculator. -
Magnetice Recording
Marvin Cameras inveted magnetic recording. It was also known as magnectic tape. It was used to record and play back audio and video. -
Vacuum Tube
Was invented by William DeForest. It was yo control electric current through a vacuum in a sealed container.
