932

0.16699

0.20215 0.21094

516

0.16602

11/32

0.18262

0.19922

13/32

0.21582

7/16

0.23242

1582

0.24902

12

0.31543

0.17578 0.19336 0.20410 0.21484 0.21094 0.22266 0.23437 0.22852 0.24121 0.25391 0.24609 0.25977 0.27344 0.26367 0.27832 0.29297 0.26562 0.28125 0.29687 0.31250 0.28223 0.29883 0.31543 0.33203 0.29883 0.31641 0.33398 0.35156 0.33398 0.35254 0.37109 0.35156 0.37109 0.39062 0.41016 0.42969 0.44922 0.46875 0.36914 0.38965 0.41016 0.43066 0.45117 0.47168 0.49219 0.36523 0.38672 0.40820 0.42969 0.45117 0.47266 0.49414 0.38184 0.40430 0.42676 0.44922 0.47168 0.49414 0.51660 0.39844 0.42187 0.44531 0.46875 0.49219 0.51562 0.53906 0.41504 0.43945 0.46387 0.48828 0.51269 0.53711 0.56152 0.43164 0.45703 0.48242 0.50781 0.53320 0.55859 0.58398 0.60937 0.44824 0.47461 0.50098 0.52734 0.55371 0.58008 0.60644 0.63281 0.46484 0.49219 0.51953 0.54687 0.57422

0.18555 0.19531 0.20508 0.21484 0.22461

0.23437 0.22559 0.23633 0.24707 0.25781 0.24609 0.25781 0.26953 0.28125 0.26660 0.27930 0.29199 0.30469 0.28711 0.30078 0.31445 0.32812 0.30762 0.32227 0.33691 0.35156 0.32812 0.34375 0.35937 0.37500 0.38184 0.39844

0.51562

0.53906

0.56250

0.58594

0.60156 0.62891

0.65625

0.65137

0.67969

0.62500 0.65625 0.68750

25/32
0.02441 0.02539
0.04883 0.05078
0.07324 0.07617
0.09766 0.10156
0.12207 0.12695
0.14648 0.15234

13/18

27/32
78 29/32
0.02637 0.02734 0.02832
0.05273 0.05469 0.05664
0.07910 0.08203 0.08496

15/16 81/32 0.02930 0.03027 0.03125 0.05859 0.06055 0.06250 0.08789 0.09082 0.09375

I

782

14

0.19531 0.20312

0.21094

0.21875

0.22656 0.23437

0.24219 0.25000

METRIC SYSTEM OF MEASUREMENTS

In the metric system of measurements, the principal unit for length is the meter; the principal unit for capacity, the liter; and the principal unit for weight, the gram. The following prefixes are used for sub-divisions and multiples: milli = 1000; centi = 100; deci = 10; deca = 10; hecto = 100; kilo = 1000. In abbreviations, the sub-divisions are frequently used with a small letter and the multiples with a capital letter, although this practice is not universally followed everywhere where the metric system is used.

All the multiples and sub-divisions are not used commercially. Those ordinarily used for length are kilometer, meter, centimeter and millimeter; for capacity, square meter, square centimeter and square millimeter; for cubic measures, cubic meter, cubic decimeter (liter), cubic centimeter, and cubic millimeter. The most commonly used weights are the kilogram and gram. The metric system was legalized in the United States by an Act of Congress in 1866.

Cubic Measure

1000 cubic millimeters (mm.3) = 1 cubic centimeter (cm.).

I are = 0.0247 acres 1076.4 square feet.
I square meter = 10.764 square feet
I square centimeter = 0.155 square inch.
I square millimeter = 0.00155 square inch.

I square mile 2.5899 square kilometers.

=

I acre = 0.4047 hectare = 40.47 ares.

I square yard = 0.836 square meter.

I square foot 0.0929 square meter = 9290 square centimeters.

I square inch = 6.452 square centimeters = 645.2 square millimeters.

I metric ton = 0.9842 ton (of 2240 pounds) = 2204.6 pounds.
1 kilogram = 2.2046 pounds = 35.274 ounces avoirdupois.
1 gram = 0.03216 ounce troy = 0.03527 ounce avoirdupois.
1 gram 15.432 grains.

I ton (of 2240 pounds) = 1.016 metric ton = 1016 kilograms.
I pound = 0.4536 kilogram = 453.6 grams.

I ounce avoirdupois = 28.35 grams.

I ounce troy = 31.103 grams.

I grain = 0.0648 gram.

1 kilogram per square millimeter = 1422.32 pounds per square inch.
1 kilogram per square centimeter

14.223 pounds per square inch.

1 kilogram-meter = 7.233 foot-pounds.

I pound per square inch = 0.0703 kilogram per square centimeter.

I calorie (metric thermal unit) = 3.968 B.T.U. (British thermal unit).

The C.G.S. System of Measurement

The C.G.S. (centimeter-gram-second) system, frequently known as the absolute system of measurement, is based upon the length and weight units of the metric system, and the second as the time unit. In this system, the unit of distance is one centimeter, the unit of mass (or weight) is one gram, and the unit of time, one second. From these fundamental units are derived:

Unit of velocity = 1 centimeter in one second.

Acceleration due to gravity (at Paris) = 981 centimeters in one second.
Unit of force = I dyne 981 gram.

Unit of work = 1 erg= 1 dyne-centimeter.

Unit of power = 1 watt = 10,000,000 ergs per second.

The C.G.S. system of power measurements is becoming more and more used in the engineering field. It is used exclusively for electrical machines and apparatus on account of the simple relationship which exists between the various units. It is likely to be soon adopted in many other fields. The unit of work, erg, is so small that in practical work the joule is usually employed instead. One joule equals 10,000,000 ergs.

Tables for Converting Inches into Millimeters. These tables give the equivalent in millimeters of every dimension up to 12 inches by 64ths. Assume, for example, that it is required to find the equivalent of 54 inches in millimeters. Locate 4 in the left-hand column and follow the horizontal line until the column headed "5" is reached. The value 133.347 is the equivalent of 51⁄4 inches in millimeters; in other words, 54 inches equals 133.347 millimeters.

Example: Find 0.856 inch in millimeters; 0.850 inch 0.006 inch = 0.152 millimeter. Hence 21.59 + 0.152 = 21.742

=

21.59 millimeters; millimeters = 0.856

0.510 12.95
0.520 13.21
0.530 13.46

0.730 18.54

0.950 24.13

0.740 18.80

0.960 24.38

0.750 19.05

0.970 24.64

0.760 19.30

0.980 24.89

0.770 19.56

0.990 25.15

0.780 19 81

1.000 25.40

20.07