1. Reference is made to two articles in the book,Temperature, Its Measurement and Control in Science and Industry(American Institute of Physics, Reinhold Publishing Corporation, New York, 1941) (1) “Measurement of Surface Temperatures,” F. C. Houghten and H. T. Olson, p. 855.
2. (2) “Temperature of Incandescent Lamps,” W. E. Forsythe and E. M. Watson, p. 1188.
3. In principle a resistance thermometer or even a liquid-in-glass thermometer can be used as well.
4. For a wet or liquid surface a non-wetting junction should be used.
5. This is caused by the temperature gradient in the ambient air and to the radiation from the surface, apart from the irregular air draughts. ΔT depends on the speed of approach and apparently also on the quickness of response on the part of the meter.