The Diaphone Fog Signal

The Diaphone Fog Signal by Jeff Laser reprinted with permission from Terry Pepper and his website Diaphones were a once familiar sound heard throughout the Great Lakes from the early 1920s until the late 1960s / early 1970s when most lighthouses were automated. 120 such installations existed on both U.S. and Canadian waterways in the 1950s. […]

‘F’ Type Diaphone Foghorn c. 1969

– John Coldwell (assistant Keeper to Walt Tansky on Pulteney Point 1969 – 1972) The diaphone is a unique organ pipe. The theory was based on a design for the Wurlitzer pipe organ invented by Robert Hope-Jones dating from 1895. A special tone generator in the organ involved a piston vibrating inside a cylinder, which […]