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).
Improved and cheaper secondary winding for D.75672 coils, requesting a new drawing.
| Identifier | ExFiles\Box 164\5\ img273 | |
| Date | 10th April 1937 | |
| 6017. By/RD. from Rm{William Robotham - Chief Engineer}/Wst. Rm{William Robotham - Chief Engineer}/Wst.1/AP.10.4.37 D.75672 COILS. We have found that the performance of these coils is improved slightly when a secondary winding consisting of 15000 turns of 42 SWG. wire is used. As this wire is cheaper and easier to handle we should like to proceed further with the tests with a view to standardisation. Will you please issue a drawing covering this alteration for reference purposes. Rm{William Robotham - Chief Engineer}/Wst. | ||