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JACK-UP RIG

A prefabricated well-drilling assembly mounted on a barge towed to the drilling site in moder

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JACKBIT

Detachable cutting end fitted to shank of miner

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JACKBLOCK

A method of system building in which the roof and floor slabs are cast on top of each other and hydraulically jacked up to their respective levels, walls being built as required,

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JACKET

Erected around an off-shore oil well and resting on the sea bed, it supports the platform carrying the drilling derrick, operating equipment and living accom

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JACKHAMMER

A hand-held compressed-air hammer drill for rock-drilling,

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JACKSON STRUCTURED PROGRAMMING

A method of top-down programming developed by Michael Jackson during the 1970s. The method stresses step-wise re

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JACKSONIAN EPILEPSY

A convulsion of a limited group of muscles spreading gradually from one group to the other, usually without loss of consciousness; the result of a lesion eg tumour of the brain.

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JACOB'S LADDER

Vertical belt conveyor with cups or buckets.

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JACOBIAN

Of n functions u, each of n variables xp the determinant whose i, jth element is du,/dxr Written

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JACOBSITE

An oxide of manganese and iron, often with considerable replacement of manganese by magnesium; crystallizes in the cubic system usually in the form of distorted octahedra. A spinel,

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