286
INDEX.
Fog-Signals, guns, 252 reed trumpet, 254 siren, 255 whistles, 253. liolophone, or sound reflector, ;
;
;
259.
motors for producing sound
for,
256. distinctions for ships' signals from those at land stations, 262.
Henderson, Professor, 246. Henry, Professor, 258-259. Herschell, Sir
proved do.,
Formula
for constructing lighthouse apparatus, 264. Franklin, B., 226. Fraser, Captain, 24, 35. Fresnel, A., 53, 72, 83, 204, 264. lens, optical agents invented by cylindric refractor, 64 63 totally reflecting prisms, 65
80.
dioptric holophote with spherical mirror, 85. dioptric spherical mirror, 86, 93. double reflecting prisms, 84. ellipsoidal mirror, 162. fixed apparatus, varied by flashes,
;
;
straight refracting, 66. concentric wick-lamp, 55, 66. catadioptric fixed apparatus
89. of,
67.
dioptric
of,
,,
67.
varied by
paraboloidal holophote, 161. revolving light, 88. — totally reflecting prisms, 83. See also Condensing System. Holmes, Professor, 164, 178, 185, 255, 257.
flashes, 70.
revolving light, 68. Fresnel, Leonor, 72, 75, 84. improved revolving apparatus
90.
catadioptric revolving apparatus,
—
;
J., 99.
Holmgren, Professor, 146. Holophoue, or sound reflector, 259. Holophotal System, 78-80. back prisms, 91. Imcatadioptric holophote, 80.
Hooghly floating lights, 220. Hook, Dr. P., 54. of,
77.
Hopkinson, Dr., 116, 117, 122,135, 136. Horsburgh Lighthouse, first revolving with totally reflecting prisms, 89.
Hot air engines, 257. Galley Head Light, 135. Gas automatic meter for producing an Hutchinson, Mr., 54. intermittent light, 135, 170. design for apparatus lighted by, 248. engines, 257. flames, focal compactness of, 191, 210. group flashing light, 135. illumination of beacons and buoys by, 167. Pintsch's buoy lighted by, 169,
176-177.
Wigham's
burners, 210.
Gordon, A., 76, 253. Gongs, 252. flashing and revolving lights, 126. Mr. Brebner's, 136. Dr. Hopkinson's, 136. Mr. Wigham's, 135.
Ice
floes, 24, 43.
— coal
52 candles, gas, 135, 178 oil, 53, 167, 170, 191, 210, 247 paraffin, 206, 209. 191, 194 focal compactness of different, 191. Inchkeith Lighthouse, first dioptric revolving apparatus in Britain, 72. Intermittent Lights. See Beacons and Buoys, Condensing System, Distinctions, Holophotal System. Iron lighthouse towers, 43.
lUuminants 53
;
electric
fire,
light,
;
;
;
;
May Light, coal fire, 52. dioptric fixed light, first in Britain,
Isle of
Group
72. Isle
Oronsay,
first
condensing appara-
tus, 112.
Guns, 252.
Japanese Lights, ment for, 231.
Haklutt's Voyages, 53. Hart, Mr., 164. Henderson, D., 94.
Jenkin, Professor, 177.
Keith's mineral
aseismatic arrange-
oil gas,
257.