4) Celebration of Corpus Christ! at

The "C" and "D" scales of the slide rule, the parts and markings of the rule. How to use these scales for multiplication and division. Supplementary filmstrip, same title, also available. 32, 41 The Slide Rule: Proportion, Percentage, Squares and Square Roots U.S. Office of Education, 1944. How to use the "B" and "C" scales of the slide rule to calculate proportions and percentages, squares and square roots; and determine the placing of decimals. Supsame plementary filmstrip, title, also r available. (OE 354; 21 minutes) 32, 41