The low‐temperature behavior of carbon‐glass thermometers in intense magnetic fields is described. At 15 T, the field‐induced error is 0.3 K at 4.2 K and 0.08 K at 2.1 K. An empirical equation is presented which fits the positive magnetoresistance data to better than 0.1% in the liquid‐helium range. No significant (<0.1%) orientation dependence was found at either 4.2 or 77 K.

1.
The samples used for this study and supplied by Lakeshore Cryotronics of Eden, NY 14057, were made from carbon impregnated glass plates developed by Corning Glass, Corning, NY 14830. The four electrical leads were attached by silver epoxying 0.05‐mm gold wires to Nichrome‐gold evaporated contacts on the devices. The devices supplied were in platinum cans.
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J. M. Swartz and J. R. Gaines, Temperature, Its Measurement and Control in Science and Industry (Instrument Society of America, Pittsburgh, PA, 1972), p. 1117. This work is concerned with GaAs only. The data on Si diodes by the same authors is to be published.
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