Earliest Computers originally _____ were computed by ______, whose job title was computers.
calculations, humans
They were typically engaged in the calculation of a mathematical expression.
human computers
The calculations of this period were specialized and expensive, requiring years of training in ___.
mathematics
The first use of the word “_____” was recorded in 1613, referring to a person who carried out calculations, or computations, and the word continued to be used in that sense until the middle of the 20th century.
computer
an ancient memory aid device to record and document numbers, quantities, or even messages.
a. Tally Sticks
is a mechanical device used to aid an individual in performing mathematical calculations.
b. Abacus
The abacus was invented in
Babylonia
The abacus in the form we are most familiar with was first used in
China
It is used to perform basic arithmetic operations.
b. Abacus
Napier’s Bones Invented by
John Napier
Allowed the operator to multiply, divide and calculate square roots by moving the rods around and placing them in specially constructed boards.
c. Napier’s Bones
Slide Rule Invented by
William Oughtred
Is based on Napier’s ideas about logarithms.
d. Slide Rule
Used primarily for – multiplication – division – roots – logarithms – Trigonometry
d. Slide Rule
Not normally used for addition or subtraction.
d. Slide Rule
Pascaline is Invented by
Blaise Pascal
It was its limitation to addition and subtraction.
e. Pascaline
It is too expensive.
e. Pascaline
Stepped Reckoner Invented by
Gottfried Wilhelm Leibniz
The machine that can add, subtract, multiply, divide automatically.
f. Stepped Reckoner
The Jacquard loom is mechanical loom, invented by
Joseph-Marie Jacquard
It is an automatic loom control by punched cards
g. Jacquard Loom
is mechanical loom
g. Jacquard Loom
A mechanical calculator invented by
Thomas de Colmar