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The Slide Rule. Early forms for doing calculations.

Published byRonald Sherman Modified over 9 years ago

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Presentation on theme: "The Slide Rule. Early forms for doing calculations."— Presentation transcript:

1 The Slide Rule

2 Early forms for doing calculations.

3 The Abacus The Chinese Abacus The School Abacus

4 The Mechanical Calculator

5 Then came: “The Slide Rule” Prior to 1980, Webster's Dictionary defined the word “COMPUTER” as a person who computes, typically with a slide rule!

6 “History of the Slide Rule” 1630 - Invention of the slide rule by William Oughtred 1630 - Invention of the slide rule by William Oughtred 1890 - William Cox of the U.S. patented the slide rule. 1890 - William Cox of the U.S. patented the slide rule. 1950 thru 1970 - The precision of the slide rule causes it to be used extensively by scientists and engineers. 1950 thru 1970 - The precision of the slide rule causes it to be used extensively by scientists and engineers. 1976 - The final slide rule made by K&E donated to the 1976 - The final slide rule made by K&E donated to the Smithsonian Institute, Washington, DC, USA. Smithsonian Institute, Washington, DC, USA.

7 During the 1960’s, the slide rule was used by every scientist and engineer. Knowing the principles of a slide rule help understand the nature of a logarithm.

8 What is a logarithm? A logarithm is the exponent or power to which a stated number, called the base, is raised to yield a specific number. A logarithm is the exponent or power to which a stated number, called the base, is raised to yield a specific number. The logarithm of 100 to the base 10 is 2 The logarithm of 100 to the base 10 is 2 This is written: log 10 100 = 2 This is written: log 10 100 = 2 So the logarithm is _____ ? So the logarithm is _____ ?

9 Apollo 11 - NASA's Lunar Lander space vehicle, with the crew Neil Armstrong, Buzz Aldrin and Michael Collins carried the slide rule, for the first time in history, into space and onto the Moon! July, 1969.

10 The Pickett 600-T (white) was taken by The Pickett 600-T (white) was taken by the Apollo 11 NASA astronauts to moon! the Apollo 11 NASA astronauts to moon!

11 The First Pocket Calculator The HP-35 “Slide Rule Calculator” First introduced in mid-1970's Sold for $295.00 or $3000 in today's money!

12 Parts of the Slide Rule

13 Using the Slide Rule

14 Multiplication (uses C and D scales) Example: calculate 2.3 × 3.4

15 Using the Slide Rule

16 Simple Division (use C & D scales) Calculate 4.5 / 7.8 1. Move the cursor to 4.5 on the D scale. 2. Slide 7.8 on the C scale to the cursor.

17 Calculate the following: 1.9 x 5 = ?

18 Calculate the following: 3.1 x 5 = ?

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