A new method of separating materials of different specific gravities: T. M. Chance. (The coal age, vol. 13, no. 19, p. 866, May 11, 1918)
- Book ID
- 104121970
- Publisher
- Elsevier Science
- Year
- 1918
- Tongue
- English
- Weight
- 65 KB
- Volume
- 186
- Category
- Article
- ISSN
- 0016-0032
No coin nor oath required. For personal study only.
✦ Synopsis
CURRENT TOPICS.
[J. F. I. ally changing with the temperature. It is the office of the compensation to eliminate the errors of time from all these causes so far as it is possible to do so. ° In the Waltham factory the watches are first run twenty-four hours at a temperature of 4o ° F., and the rate recorded. Next the watches are wound and reset, and after being allowed to run twentyfour hours at a temperature of 9 °0 F. the rate is again recorded. From these rates the amount of adjustment of the screws on the balance wheel is estimated. After retiming, the test is a trial running and is not considered final even if the watch runs within the prescribed limits for its grade, as the balance does not attain its maximum compensation on first being exposed to extremes of temperature. The temperature adjustment is of extreme importance on account of its permanency, and with the same balance and hairspring need never be blamed for any but slight variations in the performance of a watch.