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A slide rule is a hand -operated mechanical calculator consisting of slidable rulers for evaluating mathematical operations such as multiplication, division, exponents, roots, logarithms, and trigonometry. It is one of the simplest analog computers. [1][2]
To use a slide rule to multiply 2 numbers together, move the decimal points for each number you are multiplying so they fall between the values of 1 and 10. Next, find the smaller number on the D scale and slide the C scale so the "1" on the far left lines up with the smaller number.
Slide rule, a device consisting of graduated scales capable of relative movement, by means of which simple calculations may be carried out mechanically. Typical slide rules contain scales for multiplying, dividing, and extracting square roots, and some also contain scales for calculating.
This self-guided course gives numeric examples of the basic calculations that a slide rule can do. Just follow the step-by-step instructions and you will be amazed by the power and versatility of the venerable Slipstick. Click on any of the images below to get a large, unmarked, blowup of each slide rule as shown in the problem.
Apollo 11 - NASA's Lunar Lander space vehicle, with the crew Neil Armstrong, Buzz Aldrin and Michael Collins carried slide rules, for the first time in history, into space and onto the moon, July, 1969. The slide rule of choice was the aluminum pocket.
The slide rule is actually made of three bars that are fixed together. The sliding center bar is sandwiched by the outer bars which are fixed with respect to each other. The metal "window" is inserted over the slide rule to act as a place holder.
International Slide Rule Museum (ISRM) ISRM is the world's largest free digital repository of all things concerning slide rules and other math artifacts. As of 2023, ISRM is celebrating its 20th Anniversary!
The Basic Idea. It's clear how to add or subtract two lengths using two ordinary rulers. Slide rules do the same thing, add and subtract lengths, but they don't call them lengths. For example, by calling them logarithms, you can multiply and divide numbers. In fact, I don't know of any slide rule that actually let's you add or subtract numbers.
So, What Is A Slide Rule? Slide rules are typically rectangular and about the size of a ruler. They are divided into thirds, the top and bottom are fixed in place, but the middle...
The words "slide rule" may conjure up images of overwhelming complexity and technical detail for you, but the underlying concept is actually quite straightforward. At its heart, the slide rule is nothing more than a simple and elegant solution for solving basic mathematical calculations.