The depression at the free loaded end of a cantilever 4 cm. long in an electric furnace is measured by a microscope. The temperature of the furnace is measured by a platinum resistance thermometer. For aluminium, nickel and platinum, Young's modulus is found to diminish slightly with increase of temperature up to an absolute temperature about half the absolute temperature of the melting point of the material, then to decrease more rapidly, and to tend to zero as the melting point is approached. When the modulus begins to decrease more rapidly viscous flow of the material is first noticed. For fused quartz the modulus increases slowly with rise of temperature up to about 700°C. and then decreases.
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Lees et al. (1923) studied this question.