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).
Request to obtain a piece of ebonite for an H.T. Sphere Gap Voltmeter.
| Identifier | ExFiles\Box 63\1\ scan0215 | |
| Date | 7th December 1929 | |
| X3035 Roy.{Sir Henry Royce} from EFC. EFCL/ADL 7.12.29. H.T. Sphere Gap Voltmeter. In connection with the above, please obtain one piece of ebonite 6 1/2" x 3 1/2" x 1/2" EFC. | ||