Between roars of the fog signal, six bells vibrated on the air.
Fog often obscures the rays of the most powerful light, and it is then that the fog signal and the whistling buoy come into play.
The site of the camp is about a mile north of the Montara fog signal.
You know we're on government waters here and the pilot rules require us to keep a fog signal sounding once every minute.
Timed by pulsebeats, it struck once every fifteen seconds or thereabouts: undoubtedly the fog signal of some minor light-house.
There was a rush from below to the boat deck, but as there was a thick haze we decided it was only a fog signal.