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).
Data table recording coil temperature based on the rise of electrical resistance.
| Identifier | ExFiles\Box 45\4\ Scan166 | |
| Date | 5th June 1923 | |
| COIL TEMPERATURE BY RISE OF RESISTANCE. | 22407 reading (Divs. on 15 amp. range). | 22407 milliamps. (Using correction curve) | 22596 reading | 22596 millivolts (100 divs = 50 mv) | 22596 milli-amps. (100 divs = 9.33ms) | Nett milli-amps. | Resistance. (Ohms) | Temp. (oC) | |---|---|---|---|---|---|---|---| | 15.30 | 15.90 | 29.6 | 14.8 | 2.76 | 13.14 | 1.127 | 18 | | 30.6 | 31.7 | 59.3 | 29.65 | 5.53 | 26.2 | 1.131 | 18 | | 40.1 | 41.4 | 79.1 | 39.55 | 7.4 | 34.0 | 1.163 | ? 24°C | | | | | | | | 1.05 | 0 | | 39.6 | 40.9 | 87.1 | 43.55 | 8.1 | 32.8 | 1.326 | 64°C | | | | | | Wheel case position. | | | | 39.6 | | 85.1 | | | | | | | 39.5 | | 86.6 | | | | | | | 39.4 | 40.7 | 87.3 | 43.65 | 8.15 | 32.55 | 1.34 | 67°C | | | | | | Top position. | | | α = .0041 | ||