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 and test results for coil temperature after running on battery ignition and magnetos.
| Identifier | ExFiles\Box 69\1\ scan0164 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) [OB 461-8·12·24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. (5) To ...............19 Order No. WD{Mr Wood/Mr Whitehead} 15 (contd) Customer's No. Coil temperature after running the engine 1 hr on battery ignition. Primary winding 99°C Secondary winding 90°C To prove whether the coil had attained its maximum temperature, Test 3 was conducted in which the duration of each run was doubled or increased. Test 3 20HP chassis 1063. with standard coil. Car running on road. Coil temperature after running 1 hr on magneto. Primary winding 56°C. Secondary winding 58°C. Signed (contd) This Sheet must be filed on completion of the work. | ||