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The platinized plates thus obtained are quite satisfactory for the investigation of strong solutions.

In that of M. Dennstedt, which was first proposed in 1902, the substance is vaporized in a tube containing at one end platinum foil, platinized quartz, or platinized asbestos.

Asbestos prepared in this way is called platinized asbestos.

Each of these latter is located in front of the platinized point of a screw, v, which is affixed to a small metallic tongue.

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.