APPENDIX Rai 
From the above it will be seen that one degree Centi- 
grade is equivalent to 9-5 degrees Fahrenheit. Hence 
the following rules: 
1. To change C. into F. reading, multiply by 9-5 and 
add 32. 
Example: 50°C = (50 x $) +32 = 112°F, 
2. To change F. into C. reading, subtract 32 and 
multiply by 5-9. 
Example: 182°F = (182 — 32) x } =83}°C. 
METRIC SYSTEM OF WEIGHTS AND MEASURES. 
This system was devised by the French people and has 
very extensive application wherever accuracy in weights 
and measures is desired. Some of its equivalents in 
ordinary weights and measures are given in the follow- 
ing table: 
Ordinary weights and measures. Equivalents in metric system. 
LV OUNCE: (AV) rer sia ss cinsceodcseeans nieisre aieverssiiacorasn 28.35 grams. 
PQUArt ac mas pees ¢aeeaamen tia oven wearers) 0-916E Iter, 
Tigallonsasicoras sib aanonag cies ties wera es 3.7854 liters. 
] fluid ounce....... ..| 29.57. cubic centimeters (c.c.) 
..| 0.4536 kilogram. 
.| 64.8 milligrams. 
2.54 centimeters. 
0.3048 meter. 
1 pound (av.). 
1 grain. 
1 inch... 
1 foot.. 
