1. Borelius, Andersson, and Gullberg, Ing. Vetenskaps Akad. (The Royal Swedish Institute for Engineering Research), Handl., No. 169 (1943).
2. Conduction losses are always proportional to ΔT, while for ΔT sufficiently small convection losses are negligible and the radiation fourth power law may be quite accurately approximated by Pradiation∼ΔT.
3. b∕a is the time constant of the apparatus, that is, the time for a given value ofsto decay to s∕e, whereeis the Naperian base of logarithms.
4. Very low rates of change in the otherwise constant temperature environment of the specimen can be tolerated, for under these conditions the sample has sufficient time to change temperature along with the environment. Hence, ΔT is unaffected.