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All slide rules consist of logarithmic scales that can be moved in relation to each other in order to do basic mathematical calculations. The simplest slide rule would have two log scales that you could use to do multiplication and division (see my Slide Rule Introduction page for more info).
A slide rule scale is a line with graduated markings inscribed along the length of a slide rule used for mathematical calculations. The earliest such device had a single logarithmic scale for performing multiplication and division, but soon an improved technique was developed which involved two such scales sliding alongside each other.
This is circular slide rule calculate a gain, loss or SWR when measuring powers or working on antennas. A very handy device if you are an Ham. (the ISRM curator happens to be KI0CC out of Colorado). The principle is simple, the powers are on 4 decade logarithmic scales, for a 40 dB range.
Jun 7, 2023 · Understanding Slide Rules. Download Article. 1. Notice the gaps between numbers. Unlike an ordinary ruler, the numbers on a slide rule scale aren't spaced on an even, linear scale. Instead, the numbers are spaced using a special "logarithmic" formula, closer together on one side than the other.
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The image below (left bigger than the screen to maintain the detail) shows typical scales from two different slide rules. In the lower image, the graduations between 1 and 2 are marked 1.1 to 1.9, in the upper image they are marked 1 to 9.
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]
All scales have been drawn to equal length to more clearly illustrate the respective differences in scale division and to simplify the mastery of the number location method explained in Sec. 1. READING THE SLIDE RULE SCALES Odd digits (I, 3, 5, 7, 9) are located midway between marks.
