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when in operation the apparatus requires constant attendance and two watches are kept of 6 hours each
A watch is also continually kept in clear weather for the approach of a fog which can be seen 10 miles off.
A vessel ought not to be endangered from a fog for half an hour after it is formed during that the change of
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position if well determined cannot be so great as to endanger it. The steamers comeing from St John know their position and and are not troubled on account of the Fog - 
Cylinder of engine 5 inches 8 inch stroke
Sept 28
Pilot of steamer N Y can hear steam apparatus under favourable air circumstances or could 14 miles