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Updated: May 12, 2025
This may be remedied as far as possible by the insertion of plenty of waste pieces of platinum if platinized, so much the better, as that facilitates the escape of the gas. The heat should be applied to every part of the vessel, and the flame should not be allowed to play upon one single part alone. Large commercial operations are performed in green glass or stone-ware retorts.
Porcelain and other wares may be platinized, silvered, tinned, or bronzed, in a similar manner.
Black paper is more absorbent than white for these rays; and the consequence is, that with it the suddenness and vigour of the combustion are augmented. Zinc is burnt up at the same place, magnesium bursts into vivid combustion, while a sheet of platinized platinum, placed at the focus, is heated to whiteness.
Cutting off the light by the ray-filter, and placing at the focus a thin sheet of platinized platinum, the invisible rays declare their presence and distribution, by stamping upon the platinum a white-hot image of the carbons. Polarization of Heat. Whether radiant heat be capable of polarization or not was for a long time a subject of discussion.
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