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Foghorn made with a marine shell, with a hole on its narrowest side An early form of fog signal: the fog bell at Fort Point Light Station, Maine. Audible fog signals have been used in one form or another for hundreds of years, initially simply seashell horns, fog bells or gongs struck manually.
A horn cleat is the traditional design, featuring two “horns” extending parallel to the deck or the axis of the spar, attached to a flat surface or a spar, and resembling an anvil. A cam cleat in which one or two spring-loaded cams pinch the rope, allowing the rope to be adjusted easily, and quickly released when under load.
A horn is a sound-making device installed on motor vehicles, trains, boats, and other types of vehicles. The sound it makes usually resembles a “honk” (older vehicles) or a “beep” (modern vehicles). The driver uses the horn to warn others of the vehicle's presence or approach, or to call attention to some hazard.
In most horns it also determines the pitch of the sound. When vibrated by the diaphragm, the column of air in the horn vibrates in standing waves. The length of the horn determines the wavelength of the sound waves generated, and thus the fundamental frequency (pitch) of the note produced by the horn. The longer the horn, the lower the pitch.
The Pocket Rocket is a small racing keelboat, built predominantly of fiberglass.It has a fractional sloop rig, a transom-mounted rudder and a fixed fin keel.It displaces 2,400 lb (1,089 kg) and carries 1,100 lb (499 kg) of ballast.
[1] [2] [6] The boat has a draft of 5.67 ft (1.73 m) with the bulb keel down and 1.00 ft (0.30 m) with the keel retracted. It also features a retractable bowsprit for the large asymmetrical spinnaker. [1] [6] The boat has a PHRF racing average handicap of 108 with a high of 138 and low of 93. It has a hull speed of 6.21 kn (11.50 km/h). [2] [6]
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