Introduction To Computer and Early Calculating Devices

Introduction To Computer and Early Calculating Devices before electromechanical computer

1. Introduction to Computer Presented by Muhammad Ahmed

2. History and Development The computer has evolved through centuries. From the time the man first started using arithmetic, he had been inventing devices to handle numbers. Then the first calculating device Abacus invented around 3000bc. It was very useful in early times for calculating numbers.

3. Abacus A simple abacus is a rectangular wooden frame carrying several parallel wires. Each wire supports an number of beads. These beads are free to move along length of each wire when counting.

4. Mechanical Computing Devices One of the first calculating device ABACUS is still being used in many countries for kids to learn numbers and counting them. But people can calculate much accurate with the new Mechanical devices

5. Napier Bones and Logarithms In 1614, John Napier Invented L ogarithms and a calculating device called Napier Bones or Rods. This invention helped people to multiply as well it was fast and accurate

6. Slide Rule Napier idea of Logarithms soon gave birth to an other useful Calculating device called Slide Rule . It consists of two rule scales; the rule and the slide and a transparent rectangular moving piece called cursor. The cursor is capable to move smoothly on the slide rule

7. Pascaline In 1642, Blasé Pascal Invented a machine called Pascaline that could add and subtract at the age of 19. It consisted of series of wheels or dials. Each dial had 10 digits from 0 to 9 on it. These dials were geared with drums.

8. Leibnitz Calculating Device In 1672, Leibnitz invented a calculating device which could not only add and subtract but also multiply and divide.

9. Loom In 1790, Joseph Maria Jacquard, it used vertical rods to pull up threads, punched cards were used that allowed some of the rods to pass through the holes blocking the remaining rods.

10. ‘The Énd ’