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it for the polishing, which is effected by means of a willow wood
wheel, first with a mixture of pummice and rotten stone, and finished
by the same wood wheel, or lap, with a putty-powder.*
Glass Cutting, as practised in factories where steam power
is used; the drum, P, being connected by a strap to the engine,
and communicating the power to the smaller gear.
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* A preparation of tin and
lead.
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