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).
Letter to The General Electric Co. Ltd. requesting a supply of carbon granules for a potentiometer experiment.
| Identifier | ExFiles\Box 137\4\ scan0030 | |
| Date | 4th September 1929 | |
| X.634. c. Mailing. EFCL/AD. 4th September, 1929. The General Electric Co.Ltd., 34/35 Moor St.{Capt. P. R. Strong}, Birmingham. Dear Sirs, Carbon granules for potentiometer. We are anxious to know if you would be able to supply us with a quantity, say 1/2-lb, of carbon granule powder such as is used in ordinary carbon granule microphones. This is required for a special experiment which we have on hand. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||