Letter from Weston Electrical Instrument Co. detailing specifications for a Milli-voltmeter, with handwritten calculations.
| Identifier | ExFiles\Box 33\4\ Scan153 | |
| Date | 16th March 1918 | |
| X.1702 LETTER RECEIVED FROM :- WESTON ELECTRICAL INSTRUMENT CO. HOLBORN. LONDON. E.C. Your ref. EFC {E. Fowler Clarke - Electrical Engineer} 3/t16.3.18. 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. Resistance corresponding to full scale deflection is therefore .150 / .0137 = 10.94 ω for 22407 this would be about. .975 x 10.94 = 10.66 R.R. 333A (100 T'S) (H 169) 11-S-11 C. 2500 | ||
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).