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See Slime, 4. Sludge hole, the hand-hole, or manhole, in a steam boiler, by means of which sediment can be removed.

Impure dark-colored sulphuric acid that has been used in the refining of petroleum.

A bucket for removing mud from a bored hole; a sand pump.

igure-skating on a sheet of ice, usually in an arena, often accompanied by music. -- Ice sludge, bay ice broken small by the wind or waves; sludge. -- Ice spar (Min.), a variety of feldspar, the crystals of which are very clear like ice; rhyacolite. -- Ice tongs, large iron nippers for handling ice. -- Ice water. (…