Letter from Weston Electrical Instrument Company regarding a Model 1 milli-voltmeter's specifications.
| Identifier | ExFiles\Box 33\4\ Scan157 | |
| Date | 20th March 1918 | |
| X.1782 20th March/18. Your Ref: EFC {E. Fowler Clarke - Electrical Engineer} 3/T1613.18. Messrs. Rolls-Royce Ltd., Derby. X. /78 2 Dear Sirs, In reply to yours of the 16th inst., we beg to advise you that your Model 1 milli-voltmeter No. 22596 requires 13.7 M.A. for full scale deflection. Yours truly, WESTON ELECTRICAL INSTRUMENT COMPANY. (Sgd) A. {Mr Adams} Davy. 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 | ||
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).