the slide rule
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The Slide Rule
Early forms for doing calculations.
The Abacus
The Chinese Abacus
The School Abacus
The Mechanical Calculator
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!
““History of the Slide History of the Slide Rule”Rule”
16301630 - Invention of the slide rule by William - Invention of the slide rule by William Oughtred Oughtred
18901890 - William Cox of the U.S. patented the slide - William Cox of the U.S. patented the slide rule.rule.
1950 thru 19701950 thru 1970 - The precision of the slide rule - The precision of the slide rule causes it to be used extensively by scientists and causes it to be used extensively by scientists and engineers.engineers.
19761976 - The final slide rule made by K&E donated to - The final slide rule made by K&E donated to the the
Smithsonian Institute, Washington, DC, USA.Smithsonian Institute, Washington, DC, USA.
During the 1960’s, the slide rule was used by every During the 1960’s, the slide rule was used by every scientist and engineer. scientist and engineer.
Knowing the principles of a slide rule Knowing the principles of a slide rule help understand the nature of a help understand the nature of a
logarithm.logarithm.
What is a logarithm?What is a logarithm?
A logarithm is the A logarithm is the exponentexponent or or powerpower to which a stated to which a stated number, called the base, is raised to yield a specific number.number, called the base, is raised to yield a specific number.
The logarithm of 100 to the base The logarithm of 100 to the base 10 is 2 10 is 2
This is written: log 10 100 This is written: log 10 100 = 2 = 2
So the logarithm is _____ ? So the logarithm is _____ ?
Apollo 11 Apollo 11 - - NASA's Lunar Lander space NASA's Lunar Lander space vehicle, with the crew Neil Armstrong, Buzz vehicle, with the crew Neil Armstrong, Buzz
Aldrin and Michael Collins carried the slide rule, Aldrin and Michael Collins carried the slide rule, for the first time in history, into space and onto for the first time in history, into space and onto
the Moon! the Moon!
July, 1969.July, 1969.
The Pickett 600-T (white) was taken by The Pickett 600-T (white) was taken by
the Apollo the Apollo 1111 NASA astronauts to moon! NASA astronauts to moon!
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!
Parts of the Slide Rule
Using the Slide Rule
Multiplication (uses C and D scales)Example: calculate 2.3 × 3.4
Using the Slide Rule
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.
Calculate the following:
1.9 x 5 = ?
Calculate the following:
3.1 x 5 = ?
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