A contrivance serving as a fulcrum for an oar


Related Terms

KNIFE-EDGE

A sharp narrow edge resembling that of a knife, such as the fulcrum for a lever arm in a measuring instrument.

ALLIGATOR SHEARS

A cutting tool with a fixed lower blade and a movable upper blade (shearing arm) that moves in an arc around a fulcrum pin; used mainly for shearing applications that do not require great accuracy.

FULCRUM

The rigid point of support about which a lever pivots.

THOLE

A pin in the side of a boat to keep oar in place

STEERING BOARD

A long, flat board or oar that went from the stern to well underwater, used to steer vessels before the invention of the rudder. Traditionally on the starboard side of a ship (the 'steering board' side).

SLIP

1. The difference between the theoretical distance traveled per revolution of a vessel's propeller and the actual advance of the vessel. 2. The motion of the center of resistance of the float of a paddle wheel or the blade of an oar through the water horizontally. 3. The difference between a vessel's actual speed and the speed it would have if the propelling instrument acted upon a solid. 4. The velocity relative to still water of the backward current of water produced by the propeller. 5. A memorandum of the particulars of a risk for which a policy is to be executed, usually bearing the broker's name and initiated by the underwriters.

SCULL

1. An oar used for sculling. 2. A boat propelled by sculling, generally for recreation or racing.

BLADE

The flat part of an oar that is immersed in the water.

FEATHER

1) To turn the oar blade of a rowing boat horizontally with the top forward as it comes out of the water, so to skim above the water for the return stroke. 2) To point a sail boat higher into the wind to reduce pressure from the sails in a gust.

LEATHERS

Pieces of leather that are stitched and/or tacked around an oar to protect it where it rides in the oar lock. They usually have a stop or "button" to keep the oar from sliding out of the oar lock when left unattended. The button can be a thin strip of leather or knotted twine that is tacked and/or glued in place on top of the leather at the handle end of the oar.

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