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" risers.

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D.

PAGE
Decimal equivalents of parts of one inch.

69
fractions
Decimals of a foot..

69
Definition of British thermal unit.

95
conduction of heat.

99
convection of heat.

99
direct-indirect, or semidirect, radiation. 146
radiation..

145
drip pipe, relief, or bleeder.

145
dry return main.

145

95
" indirect radiation

145
" latent heat of fusion

95
vaporization

95

105
“ overhead main..

145
radiation of heat.

99
" radiator connections.

145
return main

145
risers

143
" riser connections.

145

145
specific heat

96
* steam mains.

144
temperature of fusion

95
" vaporization

95
" wet return main

145
Deliveries of water meters, Table of approximate. 333
Density of air, Pressure, volume, and

104
steam.

105
Details, Piping

151
Determining size of cooling coil, Factors for

187
sizes of piping, General rules for

154
Diagram of heat loss through walls and windows.. 116
Diameter of exhaust pipe for given horsepower, Approxi.
mate

176
" hot-water radiator connections.

203
Differential pulley

79
Dimensions of baths, Table of.

287
egg-shaped sewers, Construction and 307
laundry tubs, Sizes and..

299
wrought-iron steam, gas, and water pipe... 152
Direct flue radiators under natural draft, Heat emitted
by

170
flush, or flushometer, valve

300
indirect, or semidirect, radiation, Definition of 146
prime-surface radiators, Heat emitted by

170
radiation, Definition of..

145
Proportioning

164

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Direct radiation, Sizes of mains for two-pipe systems and 155
Discharge of pumps, Formula for...

323
pipes for hot-blast heaters, Trap

228
Disinfectants

356
Disk fans, Capacity of

216
Table of approximate air delivery of

217
Disposal of sewage

316
Distribution, Water supply and

321
District steam-heating system, Central-station or

186
Domestic hot-water supply boilers, Formula for size of

steam coils for

344
boilers, Size of grate for 316
tanks

342
Table of capacity of 343
** sizes of

314
Double-duct system of mechanical heating and ventilation 213
movable pulley

78
seam

262
Downward pressure on the bottom of any vessel, General
law for the

80
Draft, Flow of air in flues under natural

115
Heat emitted by direct flue radiators under natural 170

plain surface indirect radiators
under forced

171
Pressure

133
Drain and waste pipes, Fall for

277
Field-tile

318
Honse

261
pipes, Earthen

273
Sizes of

276
Table of grades for

277
Drainage and sewerage

303
Separate system of

303
area, Ratio of impervious surface to total

301
Combined systems of sewerage and

303
Definition of

303
fittings, Recess..

269
Recessed

263
Soil-pipe and

265
pipe, Table of weights of wrought-iron or steel 267
system details

276
House

275
Drawing, Geometrical

71
Drawings, Blueprints from

75
Drip pipe, Relief, or bleeder

145
pipes for covered steam mains, Table of sizes of. 162
risers, Sizes of

162
steam mains, Sizes of

161
Drop in pressure on sizes of mains, Effect of available. 159
or Mills, system of steam heating

150

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PAGE
Drops, Table of factors for basing sizes of mains on
available

161
Dry measure

35
pipe sprinkler system

373
return main, Detinition of.

145
returns.

161
Drying and cooling air.

240
by evaporation...

189
steam, Methods of

188
rooms, Amount of heat required in

193
Areas of flues and air openings for.. 192
Radiating sur required in

192
Volume of air required for

191
Duct and fue area increase, Table of factors for...

234
size factors based on air changes

230
supply

229
Ducts, Allowance for frictional resistance of air

231
and flues

228
Air velocities in

236
Theoretical area of

228
Capacity of natural-draft vent

236
or independent flues, Splitting air-currents to
supply branch

215
Duodecimals

6
Durham system

269
Duty of pumps, Formula for

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323

E.
Earthen drain pipes
Effect of available drop in pressure on sizes of mains
Efficiency, Furnace

of fans
Ejection, Compressed-air sewage.

Sewage.
Elbows in air pipes, Frictional resistance of
Electric gas-lighting apparatus

lights, Heat given off by
Ellipse, Formulas for.
Empirical rule for size of ordinary residence mains.
English measures into metric, Conversion table of.
Equalized system of hot-water heating.
Equivalent length of steam mains
Equivalents of parts of 1 inch, Decimal
Estimating the heat losses
Evaporation, Drying by

of boilers per pound of coal, Average
Evolution table, Involution and

273
159
139
223
311
310
235
260
118

55
155

39
199
156

69
115
189
125

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PAGE
Exhaust and vacuum steam-heating systems

173
or vacuum system of mechanical heating and
ventilation

210
pipe for given horsepower, Approximate diame-
ter of

176
steam, Approximate amount of radiation per
horsepower with.

177
heating system

173
systems of mechanical heating and ventilation,
Combined plenum and

210
Expansion and weight of pure water

362
for various substances, Coefficient of

101
of bodies by heat.

100
Extended surface indirect radiators under natural draft,
Heat emitted by

171

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F.
Factors based on air changes, Duct and fiue size.

230
supply, Duct and fue size

229
for basing sizes of mains on available drops,
Table of

161
centrifugal fans, Table of free-delivery capac-
ity

221
" determining size of cooling coil

187
duct and flue area increase, Table of.

234
sizes of mains of different lengths

157
Fahrenheit thermometer scale

98
Fall for drain and waste pipes

277
Falling bodies

76
Fan and heater, Relative position of

213
capacities

216
furnace heating system

137
Fans, Capacity of centrifugal

217

216
Efficiency of
Formula for determining free-delivery capacity of
centrifugal

220
Power required to drive cone.

218
Selection of

223
Table of approximate air delivery of disk

217
capacities of centrifugal

219
cone

218
free-delivery capacity factors for centrif-
ugal

221
Ferrules and nipples, Weight of brass

268
Brass

268
Field-tile drain

318

219

cone

* disk

223

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