From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Testing sample condensers from G.E.C. and the rejection criteria based on a 'tickling' noise under high voltage.
| Identifier | ExFiles\Box 34\1\ Scan139 | |
| Date | 20th November 1919 | |
| To Ry. from EFC. c. to O.C. EFC3/T20.11.19. X.2512 - SAMPLE CONDENSERS RECEIVED FROM G.E.C. -- We attach a copy of a table of those sample condensers received from the G.E.C. which we have tested. No.2 on this list is the one which was returned to the Salford Electrical Company and about which we have had correspondence with those people. We would like to point out that this condenser was not drilled for the bolts, but on our tests it broke down in spite of this. We cannot understand how it was that they were able to make this condenser withstand a voltage of 400 after its return, but would like to point out that some condensers do play tricks of this kind in that sometimes they appear to be broken down and at other times not. The condensers, however, which are passed through for production are, or should be only those which show no evidence of being likely to break down, i.e. which do not emit any sort of "tickling" noise when a voltage of 450 is applied. In this respect we do not agree with the opinion of the Salford Electrical Co., that this should not be made a cause of rejection, as our experience goes to show that a condenser is not really sound, and is liable to break down, if at any time it gives forth this noise on the application of the voltage. No condensers should be passed by us for production unless they are absolutely silent on the high voltage test. Contd. | ||