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 B.T.H. Co. Ltd. concerning the testing and specifications of experimental lamps.
| Identifier | ExFiles\Box 166\4\ img227 | |
| Date | 21th November 1938 | |
| . 6089 . EXPERIMENTAL DEPARTMENT. Rm{William Robotham - Chief Engineer}/RC.{R. Childs}13/JH. 21st. November, 1938. B.T.H. Co.Ltd., RUGBY. For the attention of Mr. H.W. Brown. Your ref. Lamp Works WHB. Dear Sirs, We thank you for your letter of the 18th inst. and the experimental lamps. We will test these at the first opportunity. We note that although the 3 pin caps are in a 50 m.m. bulb, that any further lamps ordered by us will be in the 39.5 m.m. lamp, similar to the Bosche capped type. We also thank you for the 12 V 36 watt. Cadmium yellow glass bulb. Will this type conform to the new French regulations? Yours faithfully, FOR ROLLS-ROYCE LTD. | ||