THE SLIDE RULE
The slide rule invented by william oughtred. It is based on the principle that actual distance from the starting point of the rule is directly proportional to the logarithm of the numbers printed on the rule. The slide rule is embodied by the two sets of scales that are joined together, with a marginal space between them. The suitable alliance of two scales enabled the slide rule to perform multiplication and division by a method of addition and subtraction.
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