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The mercury container of a barometer. Pressure of atmosphere in cistern forces mercury up the glass tube that has been exhausted of air.
Period from midnight to midnight in the mean time standard at a given place.
Interval between Sun's
upper limb being in horizon
, and his centre being 6° below it.
The year in common use. Is the Tropical year adapted for civil purposes. Has 365 days for three years and 366 in fourth with slight adjustment at ends of centuries.
Hinged valve that opens by suction and closes by gravity.
Formerly, strong plank supporting deck beams at ship's side. 2. Cleat,
on after end of a boom
, to take reef pendants. 3.
, hinged fitting for securing
heads of derrick booms
Strong nails with large
, round head. Used for fastening clamps to sides of wooden vessels.
To apply extra power
by increasing purchases used
, or by putting on additional men. 2. To set more sail.
Tongue of a bell. 2. Chafing piece in jaws of a gaff.
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