Abstract
A description is given of the construction of two instruments for determining the thermal conductivity of building materials. In both instruments a thermocouple serves as a linear heat source of constant power. The circuit of the first instrument is based on vacuum tubes, and the second on transistors. Both instruments have been used to investigate materials at positive and negative temperatures.
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L. F. Eyankelev and V. S. Roife, IFZh, [Journal of Engineering Physics],8, no. 4, 1965.
D. E. Polonnikov, Electronic Amplifiers of Automatic Compensators [in Russian], Fizmatgiz, Moscow, 1960.
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Yankelev, L.F., Bluvshtein, I.M. Vacuum-tube and transistor instruments for investigating thermal conductivity by means of a linear heat source. Journal of Engineering Physics 11, 406–409 (1966). https://doi.org/10.1007/BF00829339
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DOI: https://doi.org/10.1007/BF00829339