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An extensive summary of literature is presented which deals with (1) the design of microscope objectives suitable for high-temperature work,(2) the design of high-temperature microscope stages and furnaces, and (3) the problems of high-temperature photomicrography. Designs of microscope systems of long working distance and with numerical apertures of 0 or greater are available and have been shown to b e suitable for studying microstructures at temperatures above 750°C. Numerical apertures as low as 0.1 are suitable for the observation of specimens in image-type furnaces and for the observation of macrostructures. Several types of excellent furnaces are available commercially.

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