Howling barrel
A whistle buoy (colloquially Heulboje ) is a floating navigational aids that the navigation in the waterways used. It gives acoustic signals by means of a so-called "howler" and can thus be located even in darkness or fog.
Similar to bell barrels, the howling sound is generated by the swell . The air pressure generated by the diving movement acts on a whistle. In some US howling barrels, engl. whistle buoy, the sound signals are generated by an electric trumpet.
Howling barrels are located at important points in the fairway, for example at dangerous spots such as shallows, they mark control points, etc. Howling barrels can be found particularly in foggy coastal waters, for example in the Baltic Sea , North Sea or the English Channel .
The inventor of the howling barrel is the American Cortenay. He laid the first buoy of this type in 1876 at Sandy Hook on New York's main fairway.
literature
- For the first time howling buoys in "Schiff und Zeit 3", Koehlers Verlagsgesellschaft, Herford, 1976, p. 66.
Individual evidence
- ^ Bowditch, Nathaniel, "American Practical Navigator," HOPub. No. 9, Washington DC 1958, p. 265