6120. Memoranda Connected with Water

6120.  Memoranda Connected with Water. 1 cubic foot of water = 62.4 pounds. 1 cubic inch = .036 pounds. 1 gallon imperial = 10 pounds; or = 0.16 cubic feet, cubic foot of water = 6.2321 imperial gallons; or, approximately = 6J gallons. 1 cwt. of water = 1.8 cubic feet = 11.2 gallons. 1 ton of water = 35.9 cubic feet = 224 gallons. Cubic feet of water X .557 = cwt. approximately. Cubic feet of water x .028 = tons approximately. 1 cubic foot of sea water = 64.14 pounds. Weight of sea water = weight of fresh water X 1.028.

6121. Pressure of the Atmosphere

6121.    Pressure of the Atmosphere. In engineering, the common pressure of the atmosphere, 14.6 pounds to the square inch, is taken as a standard of that exerted by other elastic fluids. Thus, steam, or air condensed so as to exert a pressure of 30 pounds to the square inch, is said, in round numbers, to be of 2 atmospheres; at 45 pounds to the inch, 3 atmospheres, etc..

6122. Memoranda Connected with Light

6122. Memoranda Connected with Light. Velocity of light 192,000 miles per second, nearly. Decomposition of light: The seven prismatic colors of a ray of light are violet, indigo, blue, green, yellow, orange, red. Violet is the maximum chemical or actinic color; yellow the maximum illuminating color, and red the heat color.

6123. Force of the Wind

6123. Force of the Wind.

6124. Velocity of Sound

6124. Velocity of Sound. In air, 1.142 feet per second. In water, 4,900 feet. Through iron, 17,500 feet. Through copper, 10,378 feet. Through wood, 12,000 to 16,000 feet. Distant sounds may be heard on a still day: Human voice, 150 yards. Rifle 5,300 yards. Military band, 5,200 yards. Cannon 35,000 yards.

6125. Heat-conducting Power of Building Materials

6125. Heat-conducting Power of Building Materials. Conducting power of substances, slate. being 1000.

Slate............1000

Lead.............5210

Flagstone.......1110

Portland stone... 750

Brick......600 to 730

Fire-brick.......620

Chalk............564

Asphaltum........451

Oak..............336

Lath and plaster. .255

Cement..........200

6127. To Determine the Weight of Live Cattle

6127.    To Determine the Weight of Live Cattle. Measure in inches the girth round the breast, just behind the shoulder-blade, and the length of the back from the tail to the forepart of the shoulder-blade. Multiply the girth by the length, and divide by 144. If the girth is less than 3 feet, multiply the quotient by 11; if between 3 feet and 5 feet, multiply by 16 ; if between 5 feet and 7 feet, multiply by 23 ; if between 7 feet and 9 feet, multiply by 31. If the animal is lean, deduct 1/20 from the result. Or: Take the girth and length in feet, multiply the square of the girth by the length, and multiply the product by 3.36. The result will be the answer in pounds. The live weight, multiplied by .605, gives a near approximation to the net weight.