CONVERSION TABLES.

By means of the tables on pages 8 and 9, metric measures can be converted into English, and vice versa, by simple addition. All the figures of the values given are not required, four or five digits being all that are commonly used; it is only in very exact calculations that all the digits are necessary. Using table, proceed as follows: Change 6,471.8 feet into meters. Any number, as 6,471.8, may be regarded as 6,000 + 400 +70 + 1 +.8; also, 6,000 1,000 × 6; 400 = 100 X 4, etc. Hence, looking in the left-hand column of the upper table, page 39, for figure 6 (the first figure of the given number), we find opposite it in the third column, which is headed "Feet to Meters," the number 1.8287838. Now, using but five digits and increasing the fifth digit by 1 (since the next is greater than 5), we get 1.8288. In other words, 6 feet 1.8288 meters; hence, 6,000 feet = 1,000 X 1.8288 = 1,828.8, simply moving the decimal point three places to the right. Likewise, 400 feet = 121.92 meters; 70 feet 21.336 meters; 1 foot-.3048 meter, and .8 foot = .2438 meter. Adding as shown above, we get 1,972.6016 meters.

1,972.6046

Again, convert 19.635 kilos into pounds. The work should be perfectly clear from the explanation given above. The result is 43.2875 pounds.

The only difficulty in applying these tables lies in locating the decimal point; it may always be found thus: If the figure considered lies to the left of the decimal point, count each figure in order, beginning with units (but calling unit's place zero), until the desired figure is reached, then move the decimal point to the right as many places as the figure being considered is to the left of the unit figure. Thus, in the first case above, 6 lies three places to the left of 1, which is in unit's place; hence, the decimal point is moved three places to the right. By exchanging the words "right" and "left," the statement will also apply to decimals. Thus, in the second case above, the 5 lies three places to the right of unit's place; hence, the decimal point in the number taken from the table is moved three places to the left.

1,828.8

121.92

21.336

.3048

.2438

22.046
19.8416

1.3228

.0661

.0110

43.2875

English.

CONVERSION TABLE-ENGLISH MEASURES INTO METRIC.

Metric.

Inches to
Meters.

Metric.

Metric.

Square
Inches

to

Square
Meters.

Feet to Pounds to
Meters.

Kilos.

.3047973

.6095946

.9143919

.0253998

.0507996

.0761993

.1015991

1.2191892

1.8237838 2.7215550

22.7118732

26.4971854

.1269989 1.5239865
.1523987
.1777984 2.1335811
.2031982 2.4383784
.2285980
.2539978 3.0479730 4.5359250 37.8531220

3.1751475
3.6287400

30.2224976

2.7431757 4.0823325

34.0678098

Metric.

CONVERSION TABLE-ENGLISH MEASURES INTO METRIC.

Metric.

Square

Feet

.4535925

.9071850

1.3607775

1.8143700

2.2679625

to

Square
Meters.

Metric.

Cubic

Feet

to

Cubic

Meters.

Metric.

.000645150 .092901394 .028316094
.001290300 .185802788 .056632188
.001935450 .278704182 .084948282
.002580600 .371605576 .113264376
.003225750 .464506970 .141580470
.003870900 .557408364 .169896564
.004516050 .650309758 .198212658
.005161200 .743211152

.226528752

.005806350 .836112546 .254844816

.006451500 .929013910

.283160940

Gallons to
Liters.

3.7853122

7.5706244

11.3559366

15.1412488

18.9265610

1234567800

English.

Meters to Meters to
Inches.

Feet.

English.

39.370432

2.2046223

3.2808693
6.5617386

4.4092447

78.740864 118.111296

9.8426079

6.6138670

157.481728 13.1234772 8.8184894
196.852160 16.4043465 11.0231117
236.222592 19.6852158 13.2277340
275.593024 22.9660851 15.4323564
314.963456 26.2469544 17.6369787
354.333888 29.5278237 19.8416011
393.704320 32.8086930 22.0462234

Square
Meters

to

Square
Inches.

English.

English. English. English.

Kilos to
Pounds.

CONVERSION TABLE-METRIC MEASURES INTO ENGLISH.

Square

Meters

to

Square

Feet.

English.

Cubic

Meters

to

Cubic

Feet.

Liters to
Gallons.

.2641790

.5283580

.7925371

1.0567161

1.3208951 1.5850741

1.8492531 2.1134322

2.3776112

2.6417902

English.

Kilos per

Square

Meter to Pounds per Square

Inch.

1,550.03092 10.7641034 35.3156163 .001422310
3,100.06184 21.5282068 70.6312326 .002844620
4,650.09276 32.2923102 105.9468489 .001266930
6,200.12368 43.0564136 141.2624652 .005689240
7,750.15460 53.8205170 176.5780815 .007111550
9,300.18552 64.5846204 211.8936978 .008533860
10,850.21644
12,400.24736 86.1128272 282.5249304
13,950.27828
15,500.30920 107.6410340

75.3487238 247.2093141 .009956170

.001378480

96.8769306 317.8405467

.012800790 .014223100

353.1561630

SPECIFIC GRAVITIES AND WEIGHTS.

The specific gravity of solid or liquid body is the ratio between its weight and that of a like volume of distilled water. If the solid is of irregular shape, its specific gravity may be found by weighing it in air and in water; the loss of weight in water is the weight of an equal volume of water; hence, if Wis the weight in air, and W' the weight in water, W W-W

the specific gravity is

The weight of water in various conditions is as follows: