In a paper read before this Academy last year, a device for controlling comparatively high temperatures (up to about 600" C) was explained, together with the necessary auxiliary apparatus, an ordinary electro-magnet circuit breaker, and the source of constant potential necessary to operate this magnet. The oven described in that paper consisted of a properly insulated porcelain tube 30 cm. long and 5 cm. in diameter. It required 10 amperes to heat it to 450° C. The dimensions of the oven limited the size of the tubes in which the crystals were to be produced to not more than 3 cm. in diameter and 15 cm. in length, and admitted but one at a time. Inasmuch as it requires several months to produce crystals of a size such as is necessary for optical and electrical work, the disadvantage of the oven may be readily seen.
Proceedings of the Iowa Academy of Science
©1916 Iowa Academy of Science, Inc.
Tisdale, W. E.
"An Electrical Device for Securing and Maintaining Constant High Temperatures,"
Proceedings of the Iowa Academy of Science, 23(1), 209-211.
Available at: https://scholarworks.uni.edu/pias/vol23/iss1/36