George Boole outlined his rules for the new name. Boolean Algebra In his first book, The Mathematical Analysis of Logic (1847). Boolean algebra refers to the branch of algebra where the values of variables are True or False. These numbers are usually indicated by 1 and 0. This is why most computers use binary arithmetic. These are the three fundamental logic operations. AND, OR, AND NOT
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In the 1930s, when studying switching circuits, Claude Shannon
He observed that it was possible to apply Boole’s algebra to this situation, and introduced switching algebra as an algebraic method of designing circuits. Logic gates
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The relays were used to implement the first logic gates.
As part of telephone switches that are made by independent companies and Bell Labs. An electromagnet is a device that causes one or more of the electrical contacts to open (or close) when it is energized. These contacts can then be combined to operate other relays. The contacts A and B in the diagram are different relays. The first illustration shows an AND gate and the second an OR gate.
When a contact is closed, a NOT gate is activated.
Before computers were invented, telephone engineers designed logic circuits for telephone exchanges.
Complex logic circuits are possible when the outputs from one relay can be used to control other relays. This circuit is taken from The Design of Switching Circuits by Bell Labs technical staff in 1951.
The Z3
The world’s first programmable digital computer was built in 1941. It used 2200 relays. The German Aircraft Research Institute used it to analyze wing flutter statistics. It was destroyed by the Allies during the bombardment of Berlin on 21 December 1943.
The Harvard Mark 1 was another early relay computer.
It was completed in 1944. John von Neumann used the machine to perform implosion calculations in support of the Manhattan Project.
Inventors like John Atanasoff ( ABC) were also active at the time.
computer), Tommy Flowers Colossus computer), and John Mauchly (and J. Presper Eckert) ENIAC ) used vacuum tubes as relays instead.