A method for the measurement of small thermal expansion coefficients in the vicinity of room temperature is described. The thermal expansion of Invar in the room temperature range may be reduced to zero by the elimination of impurities from the basic 36 Ni, bal. Fe composition.

Topics
Thermal effects, Thermal instruments, Alloys
1.
P. Hidnert and W. Souder, Dilatometry (Am. Soc. for Metals Handbook, Cleveland, Ohio, 1948), p. 168.
2.
B. S. Lement, “Dimensional behavior of invar,” Sc.D. thesis, Department of Metallurgy, Massachusetts Institute of Technology, Cambridge, Massachusetts (September, 1949).
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© 1951 American Institute of Physics.
1951
American Institute of Physics
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