Slide rule: percentage, proportion, squares and square roots

United States, 1944

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Using a rule with only “C” and “D” scales, multiplication and division operations are revised. Problems in proportion are solved, using both left and right index. Problems in percentage solved using the proportion method. Use of the rule with “A”, “B”, “C” and “D” scales. Procedures for determining squares and square roots are demonstrated.



F.E. Brooker

production company

Loucks and Norling Studios






Black and White

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