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 results for a coil temperature test with a ballast resistance.
| Identifier | ExFiles\Box 69\1\ scan0178 | |
| Date | 15th January 1929 | |
| RR 228 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 X8710 ROLLS-ROYCE LTD. INSTRUCTIONS. To E7C. Order No. WD{Mr Wood/Mr Whitehead}28. Customer's No. X8710 15 - 1 - 1929 Coil temperature test with ballast resistance of 1 1/2 value old standard. We have now conducted tests on the bench rig with the combination of std 22 gauge coil and 1 1/2 ballast to ascertain - (1) The temperature attained by the coil left on contact on 12 volts for 3 hours continuously. (2) The coil temperature after running for 6 hrs continuously at 17.5 volts in conjunction with a standard distributor running at 700 rpm. The temperature measured in (1) was 57°C and in (2) 66°C the ambient temperature in each case Signed (contd) This Sheet must be filed on completion of the work. | ||