Table 162 con.-MILLIMETRES AND THEIR EQUIVALENTS IN INCHES. NOTE.-To convert Metres into Inches (approximately) multiply by 40, and to convert Inches into Metres (approximately) divide by 40. One millimetre ( part of a metre). 03937 inches. Table 163.-FRENCH MEASURES AND WEIGHTS OF VARIOUS METALS. The French unit of work is one kilogrammetre, or a pressure of one kilogramme exerted through a space of one metre. One kilogramme is equal to 7:233 foot pounds. The French horse-power, or cheval vapeur, is equal to 75 kilogrammetres of work done per second; or equal to 75 × 7233 = 542:47 foot pounds of work per second. The French unit of heat is the amount required to raise the temperature of 1 kilogramme of water through 1 C. AND Table 164.-CONTAINING THE TESTED PERFORMANCES Description. I Man carrying a load in a wheelbarrow up an incline of 1 in Man raising earth with a spade to a height of 5 feet. Force, Man ascending a slight incline or stairs without a load. Man on a treadwheel. Force, 144 lbs. during 8 hours 6 hours Force, 44 lbs. during Man elevating a weight by pulling a cord downwards over a pulley. Force, 40 lbs. during 6 hours Man pushing or pulling horizontally. Force, 30 lbs. during 8 hours Ox turning a mill at a moderate pace. during 8 hours during 8 hours . Ass turning a mill at a moderate pace. Horse drawing a carriage at an ordinary pace. Force, 155 lbs. during 10 hours Horse turning a mill at an ordinary pace. during 8 hours. during 8 hours Man pushing and pulling alternately in a vertical direction. Force, 144 lbs. 2 Force, 33 lbs. 3 Force, 70 lbs. 3 3.6 3.67 4 9 5 13 Man turning the handle of a crane. Force, 15 lbs. during Man turning the handle of a screw-lifting jack. Force, 20 lbs. during 8 hours Horse turning a mill at a trot. Force, 70 lbs. during 5 hours Circumferential velocity of waterwheels Velocity of mercury into a vacuum Table 164 continued. Description. 6-inch Austrian bronze steel gun, with 18 lb. charge of powder, and with a shell weighing 85 lbs. 7-inch Woolwich gun. Charge of powder, 30 lbs. ; projectile, 114 lbs. Muzzle velocity Velocity in Feet per Second. Velocity at 1476 1561 80-ton Woolwich gun. Diameter of bore, 16 inches; length of bore, 288 inches; weight of projectile, 1700 lbs.; pressure, 21 tons. Muzzle velocity 1657 71-ton Krupp gun. Diameter of bore, 15 inches; length 1703 lbs.; 2000 100-ton Woolwich gun. Weight of projectile, 2000 lb. Muzzle velocity Velocity of sound in air at 62° 2000 1125 Ditto 5060 11000 13000 19000 Sewers. For drain pipes under 6 inches diameter from 6 to 10 inches diameter. Town's supply under pressure, from 20 to 30 .83 3925 6:5 16.25 Horse towing a boat, exerting a pulling force of 120 lbs. during 10 hours 2333 31 col Ditto fast. Steam yachts Torpedo boats first-class express Velocity of light, 186,600 miles per second; solids must be heated to about 700° to produce light in the dark, and to about 1000° to produce light in daylight. Lightning travels at such a velocity that it would go 480 times round the earth in one minute. Thunder travels 380 yards in one second. Clouds travel in a high wind at a velocity of 60 miles an hour. The earth turns round upon its axis from west to east, at the rate of 1042 miles an hour at the Equator. Sound travels 13 miles in a minute in the air. A human voice on a calm day, may be heard at a distance of 20 22 25 25 40 60 CC |