A triangular topsail with its foot extended upon the gaff.

Related Terms


A unit of force equal to the force which will impart an acceleration of 1 foot per second per second to a mass of 1 ounce; equal to 0.0086409346485 newton.


The number of pounds of explosive per foot length of drill hole.


1. A standardized part of a surveyor's chain, which is 7.92 inches (20.1168 centimeters) in the Gunter's chain and 1 foot (30.48 centimeters) in the engineer's chain. 2. One of the rings of a chain. 3. A connecting piece in the moving parts of a machine.


1. The rate of change of acceleration; it is the third derivative of position with jerk pump respect to time. 2. A unit of rate of change of acceleration, equal to 1 foot (30.48 centimeters) per second squared per second.


A general-purpose bench plane measuring over 1 foot (30 centimeters) in length.


A unit of length in common use in the United States and the United Kingdom, equal to 1/12 foot or 2.54 centimeters. Abbreviated in.


A spar attached to the foot of a fore-and-aft sail.


1. the lower edge of any sail. 2. the bottom of a mast. 3. a measurement of 12 inches.


A spar used to spread the foot of a gaff-topsail.


An inclined foot rest, attached to the boat, to which a rower may place and in some instances (usually in competition) attach his feet.

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