Instruction for Using a Slide Rule | Page 7

miles per hour under the
right-hand index of the C scale.
6. Decimal Parts of an Inch.
What is 5/16 of an inch expressed as decimal fraction?
Set 16 on C scale over 5 on D scale and read the result .3125 inches on
the D scale under the left-hand index of the C scale.
7. Physics.
A certain quantity of gas occupies 1200 cubic centimeters at a
temperature of 15 degrees C and 740 millimeters pressure. What
volume does it occupy at 0 degrees C and 760 millimeters pressure?
Volume = 1200 X (740/760) * (273/288) = 1100 cubic cm.
Set 760 on C scale over 12 on D scale. Move indicator to 740 on C
scale. Move slider till 288 on C scale is under hair-line. Move indicator
to 273 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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