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<p>The paper describes the determination by an interferometer method of the thermal dilatation of a large number of ceramic material over a temperature range up to about 1000 degrees C. The specimens were in the form of tripods or pins 0.5, 8 to 10 mm. long, separating two interferometer plates of fused quart [see Abstract 1919A01057]. The under surface of the lower plate was unpolished and the upper surface of the upper plate was slightly inclined, so that the light reflected from this could be cut out of the field of vim The yellow radiation from He was used to produce the interference bands. The shift of the bands, with expansion of the separators, was observed with reference to a mark ruled on the lower surface of the u
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