Turret Deck Type. Applied to a vessel constructed on a principle introduced by Doxford, of Sunderland. Side plating curves over to form a harbour deck, and then upwards again to form a 'trunk' or 'turret'. Ships of this type are practically self-trimming. Hold pillaring is either very small, or entirely absent. Web frames are used for maintaining strength and form.
Turret Ship. Warship carrying main armament in a turret or turrets. 2. Vessel of turret deck type.
Twelfths Rule. For finding the approximate amount the tide will fall in a certain time.
1st hour's rise or fall = 1/12 of tide's range
2nd. ,, ,, ,, ,, = 2/12 ,, ,, ,,
3rd „ ,, ,, ,, = 3/12 ,, ,, ,,
4th „ ,, ,, ,, = 3/12 ,, ,, ,,
5tll „ ,, ,, ,, = 2/12 ,, ,, ,,
6th „ ,, ,, ,, = 1/12 ,, ,, ,,
Twice Laid. Rope made from good yarns taken from old ropes.
Twiddling Line. Small line made fast near hand wheel of a sailing vessel and passed round a spoke of the wheel to ease strain on arms of helmsman. Particularly useful when vessel makes stern-way. 2. Small line rove through sheaves of a yoke, the end being made fast in boat, to form a purchase for yoke lines when steering. 3. Name given to the 'twitching line' of old magnetic compasses of large diameter. These cards were sluggish in action. A small piece of sail-maker's twine was made fast to card, usually with beeswax, so that helmsman could give card a twitch if it appeared to be dead.
Twig 368 Tyzack Rail Bar
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