Instruction for Using a Slide Rule | Page 7

on C scale. Read answer, 1110, under hair-line on D scale.
8. Chemistry.
How many grams of hydrogen are formed when 80 grams of zinc react with sufficient hydrochloric acid to dissolve the metal?
(80 / X ) = ( 65.4 / 2.01)
Set 65.4 on C scale over 2.01 on D scale. Read X = 2.46 grams under 80 on C scale.
In conclusion, we want to impress upon those to whom the slide rule is a new method of doing their mathematical calculations, and also the experienced operator of a slide rule, that if they will form a habit of, and apply themselves to, using a slide rule at work, study, or during recreations, they will be well rewarded in the saving of time and energy. ALWAYS HAVE YOUR SLIDE RULE AND INSTRUCTION BOOK WITH YOU, the same as you would a fountain pen or pencil.
The present day wonders of the twentieth century prove that there is no end to what an individual can accomplish--the same applies to the slide rule.
You will find after practice that you will be able to do many specialized problems that are not outlined in this instruction book. It depends entirely upon your ability to do what we advocate and to be slide-rule conscious in all your mathematical problems.
CONVERSION FACTORS
1. Length
1 mile = 5280 feet =1760 yards
1 inch = 2.54 centimeters
1 meter = 39.37 inches
2. Weight (or Mass)
1 pound = 16 ounces = 0.4536 kilograms
1 kilogram = 2.2 pounds
1 long ton = 2240 pounds
1 short ton=2000 pounds
3. Volume
1 liquid quart = 0.945 litres
1 litre = 1.06 liquid quarts
1 U. S. gallon = 4 quarts = 231 cubic inches
4. Angular Measure
3.14 radians = PI radians = 180 degrees
1 radian = 57.30 degrees
5. Pressure
760 millimeters of mercury = 14.7 pounds per square inch
6. Power
1 horse power = 550 foot pounds per second = 746 watts
7. Miscellaneous
60 miles per hour = 88 feet per second
980 centimeters per second per second = 32.2 feet per second per second = acceleration of gravity.
1 cubic foot of water weighs 62.4 pounds
1 gallon of water weighs 8.34 pounds

Printed in U. S. A. INSTRUCTIONS FOR USING A SLIDE RULE COPYRIGHTED BY W. STANLEY & CO. Commercial Trust Building, Philadelphia, Pa.

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