204 NICHOLAS'S SEAMANSHIP AND NAUTICAL KNOWLEDGE
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QUESTIONS RELATING TO FOG SIGNALS, ETC
Articles 15 and 16.
1. What sound-signalling apparatus are steam vessels required to be
provided with?
(i) An efficient steam whistle or siren sounded by steam or some
substitute for steam, and so placed that the sound will not be intercepted
by any obstruction.
(ii) An efficient fog horn to be sounded by mechanical means.
(iii) An efficient bell.
2. What are sailing vessels of 20 tons gross tonnage and upwards
required to have?
A fog horn and bell similar to those required for steamships.
3. When are the signals described in Art. 15 to be used?
In fog, mist, falling snow, or heavy rain storms, whether by day or
night.
4. You hear one prolonged blast of a steam whistle or siren; what does
that denote?
The presence of a steamship having headway.
5. Suppose you hear two prolonged blasts with an interval of about
1 second between?
It would be a steam vessel under way but stopped, having no head-
way.
6. How often are steam vessels under way required to repeat their fog
signals?
At intervals not exceeding 2 minutes.,
7. How often are sailing vessels and vessels at anchor required to give
their fog signals?
At intervals not exceeding 1 minute.
*
8. You hear a prolonged blast followed by two short ones; what does
that indicate?
The presence of a vessel towing another; a vessel employed in laying
or picking up a telegraph cable; a vessel not under command or unable
to manoeuvre in accordance with the Rules; a vessel being towed may
also give this signal, but must not give any other.