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).
Test failures and the need for a special checking method for Dubilier Condensers.
| Identifier | ExFiles\Box 34\1\ Scan220 | |
| Date | 8th March 1921 | |
| S.D.(100 T) (S.G. 643, 19-2-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2818 X2572 STAMPS: MAR 1921; Hs{Lord Ernest Hives - Chair}; EFg; From EV{Ivan Evernden - coachwork}; RECD 2512 BY4-P8.3.21. CHASSIS - CONDENSERS. Further to my memo BY15-P24221, which I am afraid was sent to you in your absence, I would like to emphasize the need for some special method of checking Dubilier Condensers. There are two distinct items for consideration: (1) The Condensers as supplied originally by the Dubilier Company, which are failing on test. I cannot agree to allow to be despatched owing to the fact that they do not appear to be reliable. The position is that they were tested at Dubiliers, passed as O.K. with possibly a certain number of rejections, tested by Mr Brock with a further percentage of rejections. Out of quite a small number that have gone into the Works, four or five have failed on test, which shows that either the method of testing over-stresses the Condenser originally, and finally causes it to break down on a much smaller continuous load, and therefore that a different type of test is possibly required if it is considered that the original test is too drastic. This conclusion, however, does not appear to be logical, as our own Condensers have withstood it perfectly satisfactorily, unless it should happen that the method adopted by the Dubilier Company represents a higher voltage than our own. (2) The Dubilier Company have supplied us with a number of Condensers, approximately 50, which they state they have had tested at Faraday House, and which they consider would be satisfactory. I am not clear whether the Dubilier Company have tested these themselves in the first instance, or not, but in any case I would suggest that we test these in our ordinary manner, and after completing that test that you should take a number of them and put them on a continuous test, which would be somewhat more arduous than the load they would be under on a chassis. contd. | ||