The fog signal was originally a series (72 in total) of Tannoy units built into the lighthouse tower; they were powered by an alternator coupled to a 2-cylinder Ruston diesel engine. This was later replaced by a short-range Pharos Marine Omnidirectional electric emitter sounding the same characteristic of two one-second blasts every 30 seconds during fog. The fog signal was decommissioned in 2012.
>Fog signal
The fog signal was originally a series (72 in total) of Tannoy units built into the lighthouse tower; they were powered by an alternator coupled to a 2-cylinder Ruston diesel engine. This was later replaced by a short-range Pharos Marine Omnidirectional electric emitter sounding the same characteristic of two one-second blasts every 30 seconds during fog. The fog signal was decommissioned in 2012.
https://en.wikipedia.org/wiki/Tater_Du_Lighthouse