What do you call the pipe on a ship deck?

Question:
it's that thing that people hide in on old movies. Looks like a smoking pipe.

Answers:

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Its called the "ventilator". They supplied air into the ship.

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The chimney? Stack?

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in the navy we used a "bo'suns" pipe to pipe people on board the ship. it's actually a whistle. looks similar to an opium pipe.

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It is a hawser pipe and it is used for ventilation.

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It is called a cowl vent. Look here:
http://www.ahoycaptain.com/shop/dorade_m...

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These are used to vent lower decks closed to the fresh air.
Usually installed in conjuction with a baffle system to keep water from going down the pipe, called a Dorade. Also pictured at site.

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