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).
Instructions for determining the milli-volts and milli-amperes for a Weston Electrical R.P.M. Counter.
| Identifier | ExFiles\Box 33\4\ Scan207 | |
| Date | 28th January 1921 | |
| RR 300 (120B) (SF 349 24-1-19) MP 208552 X 1782 88291 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To EFE Order No. AA{D. Abbot-Anderson} 46. Customer's No. 1 Re x. 1782. X. 975 Milli-volts & Milli-amperes of Weston Electrical R.P.M Counter. The milli-volts for full scale deflection were found by connecting the instrument in parallel with inst. 98 on the 1.5 volt range, by very short leads, & applying a potentiometer tapping. This gave 520 milli-volts (1.52 volts) The milli amps were found by connecting in series with inst. 22596 and sending current from potentiometer giving, 13.5 milli-amperes. The above readings are the averages of several. No. 37043 (2) Signed F.{Mr Friese} J.{Mr Johnson W.M.} Allen This Sheet must be filed on completion of the work. | ||