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 from M-L Magneto Synd. Ltd. concerning a B.T.H. U3 rectifying valve for a High Tension Voltmeter.
| Identifier | ExFiles\Box 60\2\ Scan067 | |
| Date | 12th January 1931 | |
| X. 6094 TELEGRAMS: "CARLTON, COVENTRY." TELEPHONE 5001-2-3 The M-L Magneto Synd. Ltd. VICTORIA WORKS, COVENTRY. YOUR REFERENCE EFC {E. Fowler Clarke - Electrical Engineer} 1/AD OUR REFERENCE EAW/EE E.Fowler Clark, Esq., Messrs. Rolls-Royce Ltd., DERBY. 12th January 1931. Dear Sir, We thank you for your letter of the 9th. and would say that the Rectifying Valve we use ourselves for our High Tension Voltmeter is a B.T.H. U3, and we find this valve quite satisfactory, although we think you will find that the makers would not be prepared to guarantee it for anything like the voltage at which it is used. The reason probably is that the makers only think of these voltages in conjunction with an appreciable amount of power, whereas the power associated in this particular case is almost infinitesimal. Yours faithfully, FOR THE M-L MAGNETO SYND.Ltd. | ||