138

INDEX.

dependent on, 59.

and velocity, 61.

Friction and power, 55.

Guibal, M., fan in United States,

117.

chimney, 116.

Furnace, principle of, 24.

Gunpowder, charge of, 96.

position of, 24.

use of, 96.

power of, 27.

Hall's lamp, 36.

economy of, 92, 118.

report, 94.

danger of, 109.

Hand fans, 69.

Galileo, 2.

Head of air, 25.

39.

Headings, 72.

Heart, action of, 9.

Heat of shafts, 24.

Hedley, Mr., 129.

Horse-power, 52.

effective, 103.

nominal, 103.

Hot air, 23.
Howe, R., 113.
Hutchinson, Mr., 128.
Hydrosulphuric-acid gas, 14.
Improvements in safety-lamps, 34.
Illuminating power of, 36.
Improvements in ventilation, 73.
in fans, 110.

Indicated horse-power, 101.
Indicator-cards, 103.
Inertia, 41.
Influence of air, 5.
Injustice to men, 96.
Inspectors, 92.
Irregular airways, 85.
Large airways, 92.
Laughing-gas, 6.

Laws of air in mines, 53.
of ventilation, 92.

Le Blanc, 10.

Liability of miner, 93.
Limits of velocity, 89.
Lundhill, 73.

Lungs, action of, 8.

capacity, 130.

Nitrogen compounds, 6.
Nixon ventilator, 110.
Nominal horse-power, 103.
North of England Institute, 38, 116.
Oxygen, 7.

necessity of, S.

consumption of, 9.

starvation, 11.

Safety-lamps, discovery of, 31.

improvements, 34.
varieties, 34, 93.

illuminating power

of, 36.

reports on, 37, 38.
use of, 39.

Sulphuretted hydrogen, 13.

Sulphuric-acid gas, 14.

Sulphuric ether, 98.

Table for specific gravity, 4.

for weight of air, 21.

for velocity of winds, 29.

for water-gauge, 46.

for square root of water-

gauge, 68.

for air pressure, 107.

Velocity of air, 29.

of engines, 103.

of fan, 101, 116.

theoretical, 23, 47.

and head, 47.

and pressure, 54.

and friction, 61.

Vena contracta, 54.

Ventilation, 23.

natural, 24, 69.

and rubbing-surface, 60.

use of, 45.

as a check, 45.

and pressure, 46, 68.

formulas for, 52.

table of, 68.

and fans, 112.

Weight of mercury, 3.

of black-damp, 9.

of fire-damp, 14.

of air, 19.

of water, 44.

White-damp, 12.

Williamson's lamp, 36.

furnace, 24.

laws of, 53.

pressure of, 54.

power, 55, 103.

shaft, 69.

Winds an impediment, 28.

drift, 69.

economy of, 88.

velocity and power of, 29.