One of the largest diaphones ever constructed, the foghorn was decommissioned in 1973 because of technological advances in marine navigational equipment.
32.
The steam sirens were replaced with a Type F-2-T diaphone ( be-you ) type signal in 1936.
33.
The restored air diaphone foghorn is demonstrated throughout the year, and visitors can climb the tower for a spectacular view of Lake Michigan.
34.
The fog signal changed again in 1949 when a diaphone was installed with a character of one two-second blast every thirty seconds.
35.
A diaphone system providing 4 blasts of 1.5 seconds once every minute was installed on Inchcolm, operated by radio telephone from Inchkeith.
36.
Her aids to navigation include a 1, 000 watt primary light, a 140-decibel Diaphone horn, and a foredeck fog bell.
37.
In 1970 an electronic horn was installed, eliminating the need for engines and compressors used with the diaphone horn-and the third keeper.
38.
Many towns, especially in California and New England, used coded air horns or diaphones for fire calls and reserved sirens for civil defense use.
39.
The station was equipped with a F-2-T diaphone fog signal, which was preserved at the Great Lakes Historical Society in Ohio.
40.
When construction of the organ commenced, it was planned to have two 64-foot stops in the pedal, a Diaphone Profunda and a Dulzian.
