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).
Test report comparing the primary temperatures of various coils under different conditions at an ambient temperature of 70°C.
| Identifier | ExFiles\Box 164\5\ img346 | |
| Date | 1st December 1938 | |
| -2- RM{William Robotham - Chief Engineer}/RC.{R. Childs}8/JH.12.38. Test (3) similar to test (2) but with an ambient temperature of 70°C. No ballast. Ballast. No ballast Ballast. DELCO Wraith Special Lucas. 20,000 R.R. To our specification With case. Primary temp. 121.5°C. 94.1°C. 138.5°C. 87.5°C. Without case. Primary temp. 141°C. 83.6°C. 138.9°C. 87.5°C. In each test the temperature of the Delco Remy coil is considerably increased by removing the metal case, whereas in the other coils which have bakelite cases the opposite effect occurrs, but to a lesser degree. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||