Examination report on a failed De Jon ignition coil.
| Identifier | ExFiles\Box 164\5\ img040 | |
| Date | 9th February 1931 | |
| E7C. Ref NO. WE80. X6101. Date 9-2-31. X NOS. 6101. Examination of De Jon ignition coil. We have now unwound for examination the De Jon coil which failed on our bench test as reported in WE77/2-2-31. We were unable to ascertain the cause of failure owing to the black bitumen impregnation, but it was observed that the coil was not burnt out although signs of rather excessive heating were evident. The design and construction of the coil we found to be very interesting and gave evidence of being a high class coil. The case was made out of .012" (30SWG) sheet tin with a soldered seam, the top and bottom being spun over and soldered. The coil is mounted in the case on a porcelain disc 1 1/2" dia 5/16" thick in order to insulate the core, which is at H.T., from the metal case. A Bakelite moulding with the top tin flange of the case apparently moulded in, holds the coil in | ||
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).