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W BOSON

A particle that mediates the weak interaction; mass 81GeV; charge +1 W+ or

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W-VHS

Abbrev for wide-VHS. TN for an S-VHS variant which records widescreen high definition signals by dividing the pictures vertically and multiplexing the two halves of each field onto individual tracks. With normal definition signals it is possible to record from two sources simultaneously. S-VHS/VHS machines with 16:9 switch

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WACKE

A sandstone in which the grains are poorly sorted with respect to size,

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WADELL'S SPHERICITY FACTOR

A shape factor used in particle-size analysis, defined by the equation S=dJD, where S=Wadell

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WADSWORTH MOUNTING

A form of stigmatic mounting used for large concave gratings. The grating is illuminated by parallel light and the spectrum is focused at a distance of approximately one-half the radius of curvature of the grating,

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WAGGLE DANCE

Semicircular movements of a hive bee, including an abdominal waggle, on returning from a foraging trip of more than 150 yd from the hive; conveys information about the direction and distance of a food source to worker bees, and stimulates them to visit the site. Cf round dance

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WAGNER EARTH

A pair of impedances with their common point earthed, connected across an ac bridge network in order to neutralize the effect of stray capaci

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WAINSCOT OAK

Selected oak, cut radially to display the silver grain; much used for panelling.

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WAINSCOTING

A wooden lining, usually panelled, applied to interior walls,

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WAINSCOTING CAP

A moulding surmounting a given piece of wainscoting,

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