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has been proposed as a signal Fog sometimes accompanies on a westerly wind The sailors make a distinction between fog and vapour The latter is that which occurs in the coldest weather usually with the wind from NW [[end page]] [[start page]] [[page number in pencil]] 41 produced when the water is warmer than the air It sometimes continues several days worse in some respects than a fog for if cast away in it the sailor is frozen to death. Richies compass used and much approved for steam boats The gun is sometimes heard 4 miles and again 3/4 of a mile