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‘up funnel, down screw’

The Oxford Companion to Ships and the Sea | 2006 | 546 words | Copyright

‘up funnel, down screw’, the order given in British warships during the early days of steam propulsion when it was decided to furl the sails of a ship and proceed on the reciprocating engine. At that time, when no ship could carry enough coal to work its engine for a complete passage, the engine was used only as an auxiliary means of propulsion when the wind failed. At the order, the boiler funnel was rigged on deck and the propeller lowered in its banjo until it was clear of the hull and could be coupled to the engine shaft.

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