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 Ferranti Ltd providing specifications for a 2.5' Micro-Ammeter.
| Identifier | ExFiles\Box 168\5\ img251 | |
| Date | 5th April 1933 | |
| x 3496. ALL COMMUNICATIONS SHOULD BE ADDRESSED TO THE COMPANY FERRANTI LTD ELECTRICAL & GENERAL ENGINEERS, HOLLINWOOD, LANCASHIRE. TELEGRAMS FERRANTI HOLLINWOOD TELEPHONE FAILSWORTH 2000 (PRIVATE BRANCH EXCHANGE.) LONDON OFFICE, BUSH HOUSE. W.C.2. TELEGRAMS HLM/FERRANTI BUSH LONDON TELEPHONE: TEMPLE BAR 9325-9326 5th April, 1933. Messrs Rolls-Royce Limited, DERBY Your Ref Hs{Lord Ernest Hives - Chair}/Wst.17/KT. Our Ref 981/GG. Dear Sirs, FERRANTI 2½" MICRO-AMMETER In reply to your letter dated April 4th in connection with our 2½" dial Micro-Ammeter, a 50 division scale is provided thus giving 10 micro-amps per division. The limits of accuracy of the instrument are approximately 2% plus or minus over the major portion of the scale. Yours faithfully, FERRANTI LIMITED. Instrument Sales. | ||