Magnetoresistance of carbon-glass thermometers at liquid helium temperatures

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.