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).
From Weston Electrical Instrument Co. regarding a Model 1 Milli-Voltmeter's full scale deflection current and resistance.
| Identifier | ExFiles\Box 33\4\ Scan155 | |
| Date | 20th March 1918 | |
| MEMORANDUM. V/1782 Form No L. 210-2-17. TELEPHONE: 2029 HOLBORN. TELEGRAMS: "PIVOTED-SMITH. LONDON." FROM Weston Electrical Instrument Co., AUDREY HOUSE, ELY PLACE, HOLBORN, LONDON, E.C. To Messrs. Rolls-Royce Ltd. Nightingale Road, DERBY. Your Ref:- EFC3/T16318 X.2066 X.1782 Dear Sirs, In reply to yours of the 16th inst. we beg to advise you that your Model 1 Milli-Voltmeter No. 22596. required 13.7 M.A. for full scale deflection. Yours truly, WESTON ELECTRICAL INSTRUMENT COMPANY. [Signature] [Handwritten Note] Resistance corresponding to full scale deflection is therefore .150 / .0137 = 10.94 w. for 22407 this would be about .975x 10.94 = 10.66. | ||