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).
The production and testing of Goshawk condensers using a newly discovered insulating paper.
| Identifier | ExFiles\Box 52\3\ Scan035 | |
| Date | 2nd December 1921 | |
| R.R. 199 (250T) (SD676 19-7-17) MP1808G X4630 RECEIVED DEC 7 1921 DEC 9 1921 BYL/H. 2. 12. 21. EFC. {E. Fowler Clarke - Electrical Engineer} c. Hs. {Lord Ernest Hives - Chair} c. Mr.Gamble. c. Mr.Robinson. X.4630.'GOSHAWK' CONDENSERS. A 2512 Mr.Gamble recently reported to me that he had discovered a large quantity of very good quality varnished insulating paper which we used to use on the old coil, in stock. the thickness of same was approximately .00175" He has made up a condenser to standard dimensions, using this material. EFC. {E. Fowler Clarke - Electrical Engineer} has tested same and found that it stands up to our requirements on test. In view of the foregoing, will Mr.Gamble kindly produce six more of these condensers but in place of making them to the standard depth of .450", they should be produced to a depth of .500" as the former figure just gives a capacity of .25 micro-farads, and the increased dimension will bring us in between the limits quoted by EFC. {E. Fowler Clarke - Electrical Engineer} When Mr.Gamble hands these over to the Experimental Dept. we wish them to put same on all the Goshawk Chassis which we get running, in order to obtain some information in regard to their reliability under normal running conditions. Mr.Gamble will varnish the condensers round the edges to make them air-tight. This of course will be done whilst the condenser is warm to exclude moisture. At present the only condenser we have available are produced to the original dimensions with mica dielectrics. These should be used by the Experimental Dept. until the new paper ones are available. the great point in regard to the paper condensers we wish to have tested is that they are ordinary production type, produced with no special care beyond that required for the 40/50 Condenser at the moment. BY. {R.W. Bailey - Chief Engineer} | ||