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).
Catalogues and patent information for electrical revolution indicators.
| Identifier | ExFiles\Box 165\3\ img095 | |
| Date | 3rd July 1934 | |
| r6033. 'Roy.{Sir Henry Royce} From Hs{Lord Ernest Hives - Chair}/Wst. Hs{Lord Ernest Hives - Chair}/Wst.3/MA.3.7.34. Will you please obtain from The Record Electrical Co., Ltd., and Salford Electrical Instruments Ltd., complete catalogue of each firm's electrical revolution indicators. In the case of the latter firm we particularly want information regarding their new Tachometer using an A.C. generator and whether they have a patent on this scheme. Hs{Lord Ernest Hives - Chair}/Wst. | ||