Abstract
IT is well known that invar possesses a coefficient of linear expansion which is much smaller than those of other metals, and that measurement of its expansion over a restricted range in the region of room temperature is a matter of some difficulty. It is therefore thought worth while to direct attention to a method of measuring the coefficient of expansion which is very unusual in that it is unnecessary to know the length of the rod the coefficient of which it is desired to measure.
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References
Joule, J. P., “Collected Works”, 1, 426; Phys. Soc. Lond., 1884.
Bates, L. F., and Weston, J. C., NATURE, 145, 188 (1940).
Masumoto, H., Sci. Rep. Tôhoku Univ., 23, 265 (1934).
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BATES, L., WESTON, J. Thermal Expansion of Invar. Nature 145, 550–551 (1940). https://doi.org/10.1038/145550a0
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DOI: https://doi.org/10.1038/145550a0
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