History Of Computers Flashcards
originally calculations were
computed by humans, whose job title was
computers.
Earliest Computers
The first use of the word “computer” was recorded
in
1613
was an ancient memory aid device to record and document
numbers, quantities, or even messages.
tally stick
is a mechanical device used to aid an individual in performing mathematical
calculations.
abacus
The abacus was invented in
Babylonia in 2400 B.C.
abacus in the form we are most familiar with was first used in
China in
around 500 B.C.
It used to perform basic arithmetic operations.
Abacus
Invented by John Napier in 1614.
Napier’s Bones
Who invented Napier’s Bones?
John Napier in 1614.
operator to multiply, divide and calculate square and cube roots by moving the rods around and placing them in specially constructed boards.
Napier’s Bones
Invented by William Oughtred in 1622.
Slide Rule
Is based on Napier’s ideas about logarithms.
• Used primarily for – multiplication – division – roots – logarithms – Trigonometry
• Not normally used for addition or subtraction.
Slide Rule
Invented by Blaise Pascal in 1642.
Pascaline
It was its limitation to addition and subtraction.
It is too expensive.
Pascaline
Invented by Gottfried Wilhelm Leibniz in 1672.
Stepped Reckoner
