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MILLI- CENTIDECIDEKAHECTOKILOMETER

LITER GRAM

ARE

Name

.001 .01 .1

10. 100.

1000.

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INTERNATIONAL METRIC SYSTEM

The fundamental unit of the metric system is the METER (the unit of length). From

this the units of mass (GRAM) and capacity (LITER; were derived. All other units are the decimal subdivisions or multiples of these. These three units are simply related, so that for

all practical purposes the volume of one kilogram of water (one liter) is equal to one cubic

deC1 When the meaning of the three units and the six prefixes (shown in second column) is known, the metric system is understood. The design of the system makes it self-explanatory. The tables of derived units form themselves automatically. No tables need be or should be memorized. .... , ;i, Smaller and larger units are named b^combining the proper numeral prefix with the name

of the basic unit. The new term is self-defining—for example, "centi-meter." Here "centi" means "the one-hundredth part of," and "meter" means "the unit of length," so that "centi- meter" expresses precisely its meaning, "the one-hundredth part of the unit of length. Every other metric term is as easily formed and expresses as clearly its own definite meaning.

Name Val Meaning

METER 1. "the unit ot length"

J* "the unit ol volume"

J" "the unit of weight

*' "the unit of ares"

MILLI- .001 "the thousandth part ol" CENTI- .01 "the hundredth part of" DECI- .1 "the tenth part of" DEKA- 10. "ten times" HECTO- 100. "one hundred times" KILO- 1000. "one thousand times"

One meter=39.37 inches (exactly); 1 Iiter=1.06 quarts (nearly); 1 gram=0.04 avoirdupois ounce (nearly).

mm

4

M 1 1 ,1 1 1

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12

m

13 , I

III! III! 4, 15

T rm

CENTIMETERS

1 cm=.3937 inch

1 Inch =2.54 cm

APPROXIMATE WEIGHTS OF SOME COMMON MATERIALS

Name

Coal: Bituminous (piled loose). Anthracite (piled loose).. Coke (piled loose) Charcoal of pine and oak. .

.

Earth (common loam): Dry, loose Moist, moderately packed

Soft mud, packed

Pounds per cubic foot

44 to 54 SO to 57 23 to 32

15 to 30

72 to 80 90 to 100 110 to 120

Name Pounds per cubic foot Masonry:

Brickwork 100 to 140 Roughly scabbled mortar

rubble 140 to 150 Mortar, hardened 103 Sand 90 to 117 Gravel 90 to 117

Trap, quarried, in loose piles 107

Woods:

Fir (balsam)

Pounds per 1000 board teet Pounds per cubic foot

2170 Hemlock 2330 to 2580 Maple 3250 to 3920 Oak 3080 to 4670 Pine (American white) 1830 to 2580 Pine (yellow) 1920 to 3080

Poplar 1830 to 2580 The wood is supposed to be seasoned and of average dryness.

26 28 to 31 39 to 47

37 to 56

22 to 31 23 to 37

22 to 31

^yunaer:

Solid with rectangular sides Volume=lengthXwidthXheight Area (exclusive of that of ends)=3.1416XdiameterXheight Volume=0.7854 X diameterXdiameter Xheight

Circular No. S5, of the Bureau of Standards, entitled ["Measurements for the Household," contains in popular torm a large amount of information which is very useful about the home. In addition to discussing weighing and measuring as done in the up-to-date kitchen, this circular treats of the measurement and economical use of heat,

light, gas, electricity, water, time, etc. Copies may be obtained from the Superintendent of Documents, Government Printing Office, Washington, D. C, at 15 cents each.

HEIGHTS AND WEIGHTS OF CHILDREN

BOYS GIRLS BOYS GIRLS AGE AGE

Height Weight Height Weight Height Weight Height Weight

centi* centi- centi- centiur. mo. inches meters lbs. oz. kilograms incites meters lbs. 02. kilograms yr. mo. incites meters 16.1. oz. kilograms indies meters lbs. oz. kilograms 41 birth 201 52.3 7 10 3.45 201 52.1 7 3 3.25 2 33} 85.7 27 2 12.30 33} 84. a 26 6 11.98 3 23! 59.7 13 5.90 22 65.9 13 5.90 2 3 34i 88.3 29 13.15 331 86.0 27 4 12.36 26} 07.3 18 8.16 251 65.7 1ft 12 7.60 2 6 35} 89.9 29 8 13.38 341 88.6 28 4 12.81 7 27} 89.

2

19 2 8.68 261 67.3 17 7.88 2 9 36} 91.8 30 10 13.89 35| 00.5 29 2 13.21 8 271 70.2 19 12 8.96 27 68.6 18 4 8.28 3 371 94.3 32 4 14.63 36} 93.3 30 8 13.84 9 281 71.4 20 e 9.24 70.2 19 2 8.68 3 3 371 96.2 33 2 15.02 371 94.6 31 10 14.34 10 28} 72.4 20 14 9.47 70.8 19 8 8.S4 3 6 38} 98.1 33 12 15.31 38 96.5 32 8 14.74

11 20 73.7 21 6 9.70 2S| 72.1 20 2 9.13 3 9 39 99.1 34 8 15.65 38} 97.8 33 4 15.08

29} 74.8 21 14 9.92 281 73.3 20 12 9.41 4 39} 100.3 35 14 16.27 39 99.1 33 12 15.31

1 1 201 75.9 22 14 10.38 295 74.0 21 9.52 5 "9 105.7 41 2 18.64 41 } 104.8 39 11 18.01 1 2 30) 76.8 23 10.43 29} 74.9 21 10 9.81 6 43} 111. 1 45 3 20.50 43} 110.2 43 5 19.64 1 S 30} 78.1 23 10 10.72 30t 70.5 21 14 9.92 7 45} 116.2 49 2 22.27 45} 115.6 47 8 21.55

1 4 31$ 79.1 24 2 10.94 30} 77.

5

22 10 10.26 8 121.3 53 14 24.45 121.0 52 23.59

1 5 3l| 79.7 24 8 11.11 30} 7S.1 22 14 10.38 9 49} 120.4 59 3 26.85 49} 125.4 57 2 25.90

1 31} 80.8 24 li) 11.17 3l| 79.1 23 10.00 10 51} 131.4 65 S 29.62 51} 130.2 62 6 28.30

1 7 32} 81.9 25 8 11.57 31

1

80.0 23 12 10.77 11 531 135.3 70 3 31.84 53} 135.6 08 13 31.21 1 8 82.9 25 12 11.68 32 81.3 24 2 10.94 12 140.0 76 14 34.88 551 141.9 78 5 35.52

1 9

1 10 321 83.5 25 12 11.68 321 81.9 24 12 11.23 13 57} 145.

4

84 13 38.46 58} 148.0 88 11 40.23 331 84.4 26 14 12.19 32} 82.9 25 4 11.45 14 59} 152.1 94 14 43.05 591 152.1 98 6 44.63

1 u 33| 85.4 27 12.25 32? 83.5 25 10 11.62 15 62| 158.1 107 2 48.58 61} 155.3 106 2 48.13

16 65 165.1 121 54.88 61} 156.5 112 50.80

The data for this table were furnished by the Children's Bureau, United States Department of Labor, and is collated from such

leading authorities as Holt, Crum, Bowditch, and others. There is a variation in height and weight of healthy ehildren of the same age which should be taken into account in using the above figures to jud^e normal development.

11—7323 [OVER] WASHINGTON : GOVERNMENT POINTING OFFICE : 1820