Blasting by electricity, 244.
Blowers, Force fans and, 283.
Board measure, Timber and, 8.
Boiler incrustation, 139.
Boilers, Horsepower of, 137.
Steam, 137.
Bord-and-pillar method of
mining, 202.

Box regulator, 272.

regulator, Calculation of
pressure for, 273.
Brattice, Air, 288.

Breaking strength of a beam,
102.

strength of columns, 102.
Breasts, Buggy, 215.
Chute, 216.
Bridge, Air, 288.
Briquetting, 315.

British thermal unit, 133.
Brown coal, or lignite, 131.
Bucket, Sinking, 177.
Buggy breasts, 215.

C

Calculation of atmospheric
pressure, 249.

of mine resistance, 263.
of motive column or air
column, 281.

of power, or units of work
per minute, 264.

of pressure for box reg-
ulator, 273.

of tension of haulage rope,
295.

of ventilating pressure in
furnace ventilation, 280.
Cannel coal, 131.
Canvas doors, 288.
Capacity, Metric measures
of, 4.

of pumps and horsepower
required to raise water,
127.

Capell fan, 287.

Centrifugal fans, 282.
fans, Types of, 284.

Chain, 78.

Protection of, 153.

Classifying apparatus, Sizing
and, 309.

Cleaning safety lamps, 256.
Clearfield region method of
mining, 220.

Clinometer, 79.

Closed work method of mi-
ning, 201.

Coal, Anthracite, 130.
Bituminous, 130.
Cannel, 131.

-crushing machinery, 307.
Formations likely to con-
tain, 168.

Methods of working, 200.
or bedded materials, 170.
Removal of sulphur from,

Dams in mines, Construction

of, 120.
Masonry, 125.
Stone, 124.
Wooden, 124.

Data, Wire, 159.

Debris dams, 125.

Decimal equivalents, 12.
equivalents of parts of 1
inch, Table for, 9.

Decimals of a foot for each
-inch, Table for, 10.

Depth of shafts, Finding, 249.
Detaching hooks, 294.
Determining area of tract of
land, 84.

contents of coal seam, 84.
Direct-current circuits, Power
in, 158.

-current generators, 147.
-current motors, 147.
-current motors, Efficien-

Elevators,

Miscellaneous

forms of water, 128.
Elongation and shortening
under stress, 102.

Endless-rope haulage, Deter-
mination of friction pull
on, 296.

-rope system, 296.
Engine, Sinking, 178.
Engines, Steam, 142.
English, Conversion table for

metric measure into, 7.
measures into metric, Con-
version table for, 6.
Entries, Number of, 208.
Equal splits of air, 271.
Equivalent orifice, The, 264.
Examples in solutions of tri-
angles, 60.
Exhaust fans, 283.
Exploder, Electric, 243.
Exploration by drilling or
bore holes, 171.

Explosives, 240.
Charging, 241.

Permissible, 240.

Explosions, Mine, 258.

Fan, Capell, 287.
Disk, 282.
Nasmyth, 284.
Position of, 283.

Fans and blowers, Force,
283.

Centrifugal, 282.
Exhaust, 283.

Types of centrifugal, 284.
Fastenings, Wire-rope, 113.
Faults, Schmidt's law of,
171.

Firedamp, 252.

Electric apparatus in, 154.
Firing a charge, 242.
Flattened-strand ropes, 104.
Flow of air in pipes, Table of
loss of pressure by, 146.
of water through pipes,
119.

Flushing of culm, 239.
Force fans and blowers,
283.

Formations likely to contain

Laws, Mine ventilation, 270.
Lay of rope, 104.

Laying out curves in a mine,
90.

Length, Metric measure of, 4.
Levers, 92.

Light given by safety lamps,
Table of, 257.
Lignite, or brown coal, 131.
Linear measure, 1.
Liquid measure, 3.

Locking safety lamps, 256.
Locomotive, Compressed-air,
298.

Electric-mining, 298.
Locomotives, Gathering, 297.
Logarithms, 28.

of numbers, Table of com-
mon, 33.
Longwall face,

207.

Timbering,

method, Modifications of,
229.

method of mining, 204.
Long-ton table, 2.

Lubricant for different pur-
poses, Best, 97.
Lubrication, Friction and, 97.
of ropes, 112.

M

Machine mining, 246.
Machinery, Coal crushing,
307.

Manila rope, Horsepower of,
117.

Masonry dams, 125.

Material required for 1,000 ft.
and for 1 M. of single
track, 302.

required for single-track
road, Table of, 305.
Materials, Strength of, 98.
Meandering, Definition of,
81.

Measure, Cubic, 2.
Dry, 2.
Linear, 1.
Liquid, 3.

of angles or arcs, 2.
of length, Metric, 4.
Square, 1.

Measurement of air, Com-
position and, 247.

of ventilating currents, 261.
of pressure, 261.
of temperature, 263.
of velocity, 261.
Measures and weights, 1.
of capacity, Metric, 4.
of surface, Metric, 4.
of volume, Metric, 4.
of weight, Metric, 5.
Mechanical equivalents of
electrical units, 156.
ventilators, 281.

Mechanics, Elements of, 92.
Mensuration, 54.

M. E. P., Determination of,
143.

Mercurial barometer, 248.
Mercury column, Water col-
umn corresponding to
any, 249.

Mesh for anthracite, Revolv-
ing screen, 311.

for shaking screens, Table
of, 310.

Methane, 250.