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).
Enquiries made to source a specific rectifying valve.
| Identifier | ExFiles\Box 41\2\ Scan015 | |
| Date | 8th December 1922 | |
| X3646 To ROY{Sir Henry Royce}/MS from EFC. EFC2/T8.12.22. X.3646 - RE RECTIFYING VALVE Our enquiries for a rectifying valve have not resulted in our obtaining particulars of the kind of valve we really require. The nearest is the one listed by the Marconi Osram Valve Company. Therefore I wrote to these people as per attached letter, though I have not yet seen any answer to this. Perhaps you would kindly write on the same lines as attached letter, to the other two firms, namely, The Edison Swan Elec. Co., and the B.T.H. Company. We return previous letters herewith. EFC. | ||