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Table 162 con.-MILLIMETRES AND THEIR EQUIVALENTS IN INCHES.

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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.

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Table 163.-FRENCH MEASURES AND WEIGHTS OF VARIOUS METALS.

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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
OF MEN
ANIMALS-THE VELOCITY OF AIR, WIND, LIGHT, AND SOUND-THE
VELOCITY OF SHOT AND SHELL FROM LIGHT AND HEAVY GUNS-
THE VELOCITY OF THE CURRENT OF SEWERS, WATER PIPES, CANALS,
RIVERS, AND OCEANS-THE AVERAGE SPEED OF BOATS, SAILING
VESSELS, YACHTS, STEAMBOATS, STEAMSHIPS, TORPEDO Boats, and
OF RAILWAY TRAINS, TRAMCARS, AND OTHER CONVEYANCES, ETC.

Description.

I

Man carrying a load in a wheelbarrow up an incline of 1 in
12. Force, 132 lbs. during 10 hours
Man carrying a load on his back up a slight incline or
stairs. Force, 142 lbs. during 6 hours

Man raising earth with a spade to a height of 5 feet. Force,
60 lbs. during 10 hours

Man ascending a slight incline or stairs without a load.
Force, 142 lbs. during 8 hours .

Man on a treadwheel. Force, 144 lbs. during 8 hours
Man elevating a weight by hand.

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 .

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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.

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during 8 hours.

during 8 hours

Man pushing and pulling alternately in a vertical direction.
Force, 11 lbs. during 8 hours

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Force, 144 lbs.

2

Force, 33 lbs.

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3

Force, 70 lbs.

3

3.6

3.67

4

9

5

13

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Man turning the handle of a crane. Force, 15 lbs. during

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Man turning the handle of a screw-lifting jack. Force, 20 lbs. during 8 hours

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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.

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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
of bore, 343 inches; weight of projectile, 1715 lbs.; pres-
sure, 21 tons, nearly. Muzzle velocity
24-centimètre Krupp gun. Charge of powder, 171 lbs.
weight of projectile, 308 lbs. Muzzle velocity

1703

lbs.;

2000

100-ton Woolwich gun. Weight of projectile, 2000 lb. Muzzle velocity

Velocity of sound in air at 62°

2000

1125

Ditto

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5060

11000

13000

19000

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Sewers. For drain pipes under 6 inches diameter

from 6 to 10 inches diameter.

Town's supply under pressure, from 20 to

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30

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.83

3925

6:5 16.25

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Horse towing a boat, exerting a pulling force of 120 lbs.

during 10 hours

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2333

31

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Ditto fast.

Steam yachts

Torpedo boats

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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

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20

22

25

25

40

60

CC

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