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 testing the milli-volt and milli-ampere readings for a Weston Electrical R.P.M. Counter.
| Identifier | ExFiles\Box 165\3\ img033 | |
| Date | 28th January 1921 | |
| RR 300 (1203) (SF 349 24-1-19) MP 200552 X975 66033 88291 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: EFC Order No: AA{D. Abbot-Anderson} 46 Customer's No.: 1 Date: 28-Jan-1921. Re: X.1782. Milli-volts & Milli-amperes of Weston Electrical R.P.M Counter. X975 The milli-volts for full scale deflection were found by connecting the instrument in parallel with inst. 9X on the 1.5 volt range, by very short leads, & applying a potentiometer tapping. This gave 520 milli-volts (.52 volts). The milli-amps were found by connecting in series with inst. 22576 and sending current from potentiometer giving 13.5 milli-amperes. The above readings are the averages of several. Signed: F.{Mr Friese} J.{Mr Johnson W.M.} Allen This Sheet must be filed on completion of the work. | ||