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HACK

A long parallel bank, about 6 in 150 mm high, of brick, rubbish and ashes, on which bricks are laid in the course of manufacture, when it is intended to dry them in the open.

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HACK-BARROW

A barrow used to carry green bricks to the hack for drying.

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HACKAP

A small timber structure erected to provide cover for a hack,

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HACKER

Colloq term for 1 a person who writes programs of a somewhat routine nature. 2 a person who obtains unauthorized access through information net

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HACKING

1 The operation of piling up green bricks on a hack to dry. 2 The process of making a surface rough, in order to provide a key for plasterwork. 3 A course of stones in a rubble wall, the course being composed partly of single stones of the full height of the course and partly of shallower stones arranged two to the height of the course.

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HACKLE

Rough, ridged region of tensile fracture surface in brittle materials which follows the mirror and mist regions. The surface in the hackle region makes an angle to the previous plane of crack propagation, because the crack has branched while running at maximum fracture velocity, frequently ejecting a piece of material. See fractography.

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HACKLING

Process of combing scutched flax in the hackling machine, in order to divide and parallelize the long fibres, and to remove the short ones and impurities,

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HACKMANITE

A fluorescent variety of sodalite, showing on freshly fractured surfaces a pink colour which fades on exposure to light, but which returns if kept in the dark or subjected to X-rays or ultraviolet light. See tenebrescence.

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HACKSAW

1 A mechanic

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HACKWORTH VALVE GEAR

A radial gear in which an eccentric opposite the crank operates a link whose other end slides along an inclined guide, the valve rod being pivoted to a point on the link.

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