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).
Continuation of a letter discussing the suitability of a valve for testing insulating materials.
| Identifier | ExFiles\Box 41\2\ Scan014 | |
| Date | 8th December 1922 guessed | |
| Contd. -2- the same valve would suit is for testing insulating materials with a high applied D.C. potential, this being obtained with the aid of such a valve from a H.T A.C. transformer which we have, and a suitable reservoir condenser, the electrostatic voltmeter again being used. In all probability you have another list dealing with valves of this type which we should be glad to receive. Yours faithfully, FOR ROLLS-ROYCE LIMITED. [Watermark: DICKINSON BOND] EFC1/T. | ||