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).
Specifications and reading correction factors for box instruments 42 and 92.
| Identifier | ExFiles\Box 33\4\ Scan184 | |
| Date | 19th February 1920 | |
| X. 1782 19.2.20. To L. Furner) * R.C.S.Jamie) from EFC. X.1782 - RE BOX INSTRUMENTS 42 & 92. Instrument 42. 21 Instrument only. Terminal voltage for full scale deflection = .0181. (Scale proportional). Amperes for full scale deflection = .0100. Resistance 1.81 23. 1.5 volt range. Correct to .5% 24. 15 volt range. Correct to .5% 25. 150 volt range. Correct to .5% if .5% be deducted from readings. 27. 1.5 ampere range. Deduct .5% from all readings. 28. 15 ampere range. Reading. Deduct. 0 to 3.5 1% 3.5 to 11.5 Correct 11.5 to 15.0 .5% | ||