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 on coil operating temperatures and performance with a metal sheath.
| Identifier | ExFiles\Box 69\1\ scan0115 | |
| Date | 8th December 1924 | |
| RR 236 (150 BKS.) (DB{Donald Bastow - Suspensions} 451-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To_____________________ (3) ______________________19__ Order No._______________ Customer's No.__________ metal sheath wound the outside of the coil case. The effect was observed by running the coil normally at 17.5 volts for 2 hrs, thus allowing the coil to warm up, and then ascertaining the amount of series gap that could be inserted without causing misfiring on the H.T. gaps set to 5 m/m.{Mr Moon / Mr Moore} Results With regard to tests under (a) above we found the maxm temperatures attained by the coils to be :- Coarse { Coil X. 52°C after 5 hrs run 40°C " 1 1/2 hrs on contact Fine { Coil Y. 69°C after 5 hrs run 65°C " 1 1/2 hrs on contact. Signed (Contd) This Sheet must be filed on completion of the work. | ||