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Composition of purified gas, 235.
Concrete tanks, 143.
Condensation, description of, 69.
Condensers, annular atmospheri-
cal, 72.

area required, 75.
battery, 73.

horizontal atmospherical, 71.
Livesey water, 74.

Morris and Cutler water, 74.
vertical, 71.

Corrections for temperature and
pressure, 227.
Cowan's governor, 180.
prepayment meter, 211.
pressure changer, 182.

Dempster's exhauster, 79.
sulphate of ammonia plant,
249.

water-gas apparatus, 244.
Deposition of carbon in retorts,
34.

Differential or district governor,

184.

pressure gauge, 134.

Dip-pipe, 37.

Donkin's exhausters, 81.

Dry meter, 208.

D-shaped retorts, 17.

Duration of retorts, clay, 18.
iron, 18.

Evans' photometer, 169.

Examination papers, specimen,

252.

Exhauster, the use of, 77.
advantages of using, 78.
Anderson's, 78.
Dempster's, 79.
Donkin's, 81.
Gwynne's, 80.
Jones's, 78.
Laidlaw's, 78.
Methven's, 78.
Waller's, 82.

Fire-clay retorts, 16.
Fishtail burners, 220.
Flange joints, 192.

Flat-frame burners, 220.
Foulis Arrol stoking machine,
47.

Fuel required for carbonizing, 30.
Furnace, ordinary, 25.
generator, 26.
regenerative, 27.

Gadd's system of guide framing,
150.

Gas-holder, capacity of, to find,
151.

pressure of, to ascertain, 151.
rise allowed in crown, 147.
single lift, 146.
telescopic, 148.

trussed and untrussed roof, 147.
Gas-holder tanks, annular, 139.
brick and puddle, 141.
cast-iron, 144.

concrete, 143.

Gas meter, compensating, 206.
dry, 208.
prepayment, 211.

Warner and Cowan's, 206.
wet, 203.

Gauge, pressure, 133.

differential, 134.

King's, 135.

Thomas's, 135.
Generator furnace, 27.
Governor, district, 184.
exhauster, 84.
station, 175.

station, Braddock's, 178.
station, Cowan's, 180.
station, Hunt's, 179.

Hartley's candle balance, 164.
Holman's eccentric fastener for
retort lids, 36.

Horizontal condenser, 71.
Hunt's governor, 179.

Hydraulic main, 37.

Illuminating power tested by

Bunsen photometer, 164.
power by jet photometer, 131.
Impurities in crude gas, 86.
Incandescent burner, 225,
Iron retorts, 16.

Jet photometer, Lowe's inferential,

131.

Jointing mains, 186.

Jones's exhauster, 78.

Kirkham, Hulett, and Chandler's
washer-scrubber, 104.

Laidlaw's exhauster, 78.

Lead papers, to prepare, 128.

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