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A crack resulting from restriction of metal in a mold while contracting.



Related Terms

SPECULUM

An optical instrument reflector of polished metal or of glass with a film of metal.

PIKE POLE

  1. A pole with a sharp metal point in one end that is used to hold utility poles upright while they are being installed. 2. See fire hook.

ELECTRIC TAPE GAGE

A tide gage consisting of a monel metal tape on a metal reel (with supporting frame), voltmeter, and battery. The tape is graduated with numbers increasing toward the unattached end. Tidal height

CAR SEAL

Metal strip and lead fastener used for locking freight car or truck doors. Seals are numbered for record purposes.

BASE SCREED

A metal screed with expanded or short perforated flanges that serves as a dividing strip between plaster and cement and acts as a guide to indicate proper thickness of cement or plaster.

MITER BOX

A troughlike device of metal or wood with vertical slots set at various angles in the upright sides, for guiding a handsaw in making a miter joint.

SAFETY-VALVE MUFFLER

A silencer designed so that it will not cause appreciable restriction to steam flow.

ELECTROSTATIC VOLTMETER

A voltmeter in which the voltage to be measured is applied between fixed and movable metal vanes; the resulting electrostatic force deflects the movable vane against the tension of a spring.

CASING

A covering of sheets of metal or other material such as fire resistant composition board used to enclose all or a portion of a steam-generating unit.

BUMPER

  1. A metal bar attached to one or both ends of a powered transportation vehicle, especially an automobile, to prevent damage to the body. 2. In a drilling operation, the supporting stay between the main foundation sill and the engine block. 3. In drilling, a fishing tool for loosening jammed cable tools.

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