Evelyn brought the last of three trays to the table.
When the trays were stowed he said, You have something on your cheek, let me get it.
Crystals and precipitates, deprived of as much water as possible by centrifugal machines or filter-presses, are transported by means of a belt, screw, or other form of conveyer, on to trays staged in brick chambers heated directly by flue gases or steam pipes; the latter are easily controlled, and if the steam be superheated a temperature of 300° and over may be maintained.
Thus prepared, the specimens are placed on shelves or movable trays, at intervals of about 6 in., in an air-tight cupboard, on the inner side of the door of which, as a special protection against insects, is suspended a muslin bag containing a piece of camphor.
Small objects are often heaped together in perforated trays or ladles, the cathode connecting-rod being buried in the midst of them.
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