devacuation

plural devacuations

1. countableuncountableLoss or removal of vacuum (“reduction of pressure below that of the atmosphere”).

   1963, B. W. Spear, D. E. Powell, Kimcode, a method for controlling devacuations of television tubes, IEEE Trans Broadcast Telev. Receivers, 1963, 9, 25

   4 more examples

   […] 1960 shows an increase in resistance from 22 to 30 ohms which was related to a loss in vacuum. It can be seen that in this case, over the period of the latter 4 years, the total frequency change due to both devacuation and ageing ...

   1964, Proceedings of the ... Annual Symposium on Frequency Control

   First acquire a defunct oscilloscope C.R.T. of the flat face variety and devacuate it. The method I used to devacuate is as follows : First wrap the C.R.T. in a blanket, with only the extreme socket end exposed. Next, with the base pointed away from yourself, gently file a minute hole in the evacuation nipple of the C.R.T. If this is done carefully, devacuation will occur...

   1976, CQ: The Radio Amateurs' Journal, volume 32, page 71

   1981, L. Brandsma, H. D. Verkruijsse, Synthesis of Acetylenes, Allenes, and Cumulenes: A Laboratory Manual, Elsevier Science Limited After removal of the solvents and after distillation in an oil-pump vacuum nitrogen must be used for the devacuation.

   […] prevents slow propagation of surface flaws, encountered in service, which would otherwise lead to devacuation of the CRT. […] must not exceed the threshold value to prevent flaw growth and preserve vacuum over the life of CRT.

   1995, Proceedings of XVII International Congress on Glass