From “The Light-Houses of the United States” in Harper's New Monthly Magazine (Vol. 48, Dec. 1873 to May 1874):Fog-signals, many of which are required at different points on the Atlantic and Pacific coasts, are of several kinds. Some are steam-whistles, the sound of which is made deeper or louder by being sent through a trumpet; but the most effective is probably the Siren. This ingenious machine consists of a long trumpet and a steam-boiler. The sound is produced by the rapid revolution past each other of two flat disks pierced with a great number of small holes; a jet of steam under high pressure is projected against the disks, which revolve past each other more than a thousand times a minute; as the rows of small holes in the two disks come opposite each other, the steam vehemently rushes through and makes the singular and piercing noise which a Siren gives out. One of these machines, of which a drawing is given [above]; costs about $3500 complete, with its trumpet, boiler, etc.
Daboll’s trumpet is worked by an Ericsson engine, and requires no water for steam.
Daboll’s trumpet is worked by an Ericsson engine, and requires no water for steam.
From the 1893 Light-House Board Annual Report (note the vast quantities of fuel):
Fog Signals Operated by Steam or Hot-Air Engines
913. Tillamook Rock, Oregon.—The first-class siren, in duplicate, was in operation some 316 hours and consumed about 16 tons of coal.
914. Columbia River light-vessel No. 50, Washington.—The 12-inch steam whistle was in operation some 802 hours and consumed about 71 tons of coal.
969. Destruction Island, Washington.—The first-class steam siren, in duplicate, was in operation some 825 hours and consumed about 49 tons of coal.
970. Cape Flattery, Washington.—The 12-inch steam whistle, in duplicate, was in operation some 520 hours and consumed about 32 tons of coal and about 100 feet of wood.
974. Point Wilson, Washington.—The 12-inch steam whistle was in operation some 157 hours and consumed about 16 tons of coal.
980. West Point, Washington.—The Daboll trumpet was in operation some 195 hours and consumed about 2 tons of coal and about 76 feet of wood.
982. Robinson Point, Washington.—The 12-inch steam whistle was in operation some 56 hours and consumed about 5 tons of coal.
1011. Turn Point, Washington.—The Daboll trumpet was in operation some 54 hours and consumed about 1 ton of coal.
1012. Patos Islands, Washington.—The Daboll trumpet was in operation some 90 hours and consumed about 1 ton of coal.
914. Columbia River light-vessel No. 50, Washington.—The 12-inch steam whistle was in operation some 802 hours and consumed about 71 tons of coal.
969. Destruction Island, Washington.—The first-class steam siren, in duplicate, was in operation some 825 hours and consumed about 49 tons of coal.
970. Cape Flattery, Washington.—The 12-inch steam whistle, in duplicate, was in operation some 520 hours and consumed about 32 tons of coal and about 100 feet of wood.
974. Point Wilson, Washington.—The 12-inch steam whistle was in operation some 157 hours and consumed about 16 tons of coal.
980. West Point, Washington.—The Daboll trumpet was in operation some 195 hours and consumed about 2 tons of coal and about 76 feet of wood.
982. Robinson Point, Washington.—The 12-inch steam whistle was in operation some 56 hours and consumed about 5 tons of coal.
1011. Turn Point, Washington.—The Daboll trumpet was in operation some 54 hours and consumed about 1 ton of coal.
1012. Patos Islands, Washington.—The Daboll trumpet was in operation some 90 hours and consumed about 1 ton of coal.
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