The equivalent of two helical gears of opposite hand placed side by side.



Related Terms

CLASS B PUSH-PULL SOUND TRACK

Two photographic sound tracks side by side, one of which carries the positive half of the signal only, and the other the negative half; during the inoperative half-cycle, each track transmits little or no light.

OPTICAL SQUARE

A surveyor's hand instrument used for laying of right angles; employs two mirrors at a 45 angle. optician

COUNTERLATH

  1. A strip placed between two rafters to support crosswise laths. 2. A lath placed between a timber and a sheet lath. 3. A lath nailed at a more or less random spacing between two precisely spaced laths. 4. A lath put on one side of a partition after the other side has been finished.

BADGER PLANE

A hand plane whose mouth is cut obliquely from side to side, so that the plane can work close up to a corner. Also known as badger.

MULTIPLE CARTRIDGES

Filter medium made up of two or more filter cartridges, either fastened end to end or arranged side by side (in series or parallel flow respectively).

PORT SIDE

The left hand side of a ship facing the front or forward end. The port side of a ship during darkness is indicated by a red light. Was previously known as the larboard side but this created confusion with starboard and was changed.

PINCH GRASP

A grasp by the human hand that involves the thumb and the facing side of the index finger at the knuckle; used to apply a large force to a small object. Also known as key grasp.

BAYONET COUPLING

A coupling in which two or more pins extend out from a plug and engage in grooves in the side of a socket.

JOINTER

  1. Any tool used to prepare, make, or simulate joints, such as a plane for smoothing wood surfaces prior to joining them, or a hand tool for inscribing grooves in fresh cement. 2. A file for making sawteeth the same height. 3. An attachment to a plow that covers discarded material. 4. A worker who makes joints, particularly a construction worker who cuts stone to proper fit. 5. A pipe of random length made from two joined, relatively short lengths.

FLUIDIC OSCILLATOR METER

A flowmeter that measures the frequency with which a fluid entering the meter attaches to one of two opposite diverging side walls and then the other, because of the Coanda effect.

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