A machine, usually powered by hydraulic means, consisting of two or more prongs which can be raised and lowered and are inserted under heavy materials or objects for hoisting and moving them.


Related Terms

PERISTALTIC PUMP

A device for moving fluids by the action of multiple, equally spaced rollers, which rotate and compress a flexible tube.

MOVING-CONDUCTOR LOUDSPEAKER

[ENG ACOUS] A loudspeaker in which the mechanical forces result from reactions between a steady magnetic field and the magnetic field produced by current flow through a moving conductor.

MICROMANIPULATOR

A device for holding and moving fine instruments for the manipulation of microscopic specimens under a microscope.

MEGOHMMETER

An instrument which is used for measuring the high resistance of electrical materials of the order of 20,000 megohms at 1000 volts; one direct-reading type employs a permanent magnet and a moving coil.

MECHANICAL PUMP

A pump through which fluid is conveyed by direct contact with a moving part of the pumping machinery.

LIVE LOAD

A moving load or a load of variable force acting upon a structure, in addition to its own weight.

LINK

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.

LINE SCANNER

An infrared imaging device which utilizes the motion of a moving platform, such as an aircraft or satellite, to scan infrared radiation from the terrain. Also known as thermal mapper.

JACK CHAIN

1. A chain made of light wire, with links arranged in figure-eights with loops at right angles. 2. A toothed endless chain for moving logs.

ION-BEAM SCANNING

The process of analyzing the mass spectrum of an ion beam in a mass spectrometer either by changing the electric or magnetic fields of the mass spectrometer or by moving a probe.

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