Accidents in mines, 73.

causes of, 96.
prevention of, 92.
decrease of, 93.

Acceleration of gravity, 22.
Action of choke-damp, 11.
of white-damp, 12.

of fan and furnace, 112.

Adding airways, 82.
Adjustable fan-shutter, 116.
After-damp, 11.

Air, properties of, 1.

height of, 2.

Air for sanitary purposes, 90.

measurements, 97.
quantity per horse, 91.
quantity per lamp, 91.

quantity per man, 128.
Airways, perimeter of, 42.

sectional area of, 42.
different lengths of, 59.
addition of, 85.

enlargement of, 92, 97.

Anemometers, 99.

varieties of, 99.

Aneroid barometer, 105.
Area, 42.

and quantity, 61.

Arnold, Mr., 98.

Asphyxia, treatment of, 130.

Atkinson, Sir John, 47, 49.

Atmosphere, thickness of, 1.

pressure of, 2.

variations of, 27.

Barometer, discovery of, 2.

correction for, 104.

use of, 106.

135

diffusion of, 10.

of white-damp, 12.
of sulphuretted hy-
drogen, 13.

of fire-damp, 14.

Compressed air in mines, 69.

Contractions in airways, 97.

Correction for anemometer, 100.

for barometer, 104.

by fan, 92, 118.

by furnace, 92,

118.

properties of, 10.

sources of, 10.

fatal nature of, 11.

Carbonic oxide, 12.

fatal effects of, 13.

Centrifugal ventilators, 110, 115.
Changes of temperature, 28.
Champion ventilator, 111.
Chesterfield and Derbyshire Insti-

tute of Mining Engineers, 113.
Choke-damp, 9.

Circular airways, 43.

Clanny safety-lamp, 31.

Coal-dust in dry mines, 95.

Darlington's testimony, 37.
Davy's experiments, 15.

lamp, 32.

Daubisson, M., 53.

Defective ventilation, 10, 17, 73.
De la Roche, M., 4.

Deputy lamp, 37.

Design of ventilation, 97.

Detection of fire-damp with can-
dle, 30.

Detection of fire-damp with safety-
lamp, 39.

Duty of miners, 92.

Economy of furnace and fan, 120.

detection of, 39.

Fire-proof brattice-cloth, 70.

Force, estimation of, 44.

Formula for cubic foot of air,
20.

for total pressure, 50.

for pressure, 50.

for motive-column, 26, 51.
for water-gauge, 52.
for quantity, 52.

for units of work, 52.
for horse-power, 52.

Formulas, 49, 121.
Foster, T. J., 129.
Frankland, Dr., 3.
Free fall, 22.
Friction, 41.

and area, 43.
co-efficient of, 47.
to overcome, 44.
and pressure, 59.