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).
Standardisation of an ignition coil with a reversed primary to reduce plug voltage.
| Identifier | ExFiles\Box 164\5\ img294 | |
| Date | 17th June 1937 | |
| RR 755A (5H) 22635 9/9/36 J.W.S. COMPLETED 23.8.37. 25/30 H.P. STANDARDISATION OF PARTS Date: 17.6.37. X No. D13. Drawing No. Part List Description of Parts: IGNITION COIL WITH REVERSED PRIMARY Origin: To reduce plug voltage. Report of Experimental Test: Tests on Exptl. Bantam III cars shew that misfiring which occurs when the plug gaps erode beyond a certain amount can be improved by reversing the coil polarity. There is no electrical difference in the coil from an insulation point of view warranting endurance tests. MATERIAL £ s. d.{John DeLooze - Company Secretary} LABOUR £ s. d.{John DeLooze - Company Secretary} CHARGES £ s. d.{John DeLooze - Company Secretary} TOTAL £ s. d.{John DeLooze - Company Secretary} Cost of Old Part Cost of New Part Nett Increase/Decrease No Difference. Signature from Cost Dept. that above is correct. G/RL 28.7.37. INITIAL | DATE | REMARKS SG.{Arthur F. Sidgreaves - MD} | 20-8-37 | Agreed SG{Arthur F. Sidgreaves - MD} Hs.{Lord Ernest Hives - Chair} | | Agreed Hs.{Lord Ernest Hives - Chair} C. | 6.8.37 | Agreed C. DA.{Bernard Day - Chassis Design} | 12.8.37 | Agreed Da.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} | 3.8.37 | Agreed By.{R.W. Bailey - Chief Engineer} RHC{R. H. Coverley - Production Engineer} | 3.8.37 | Agreed RHC.{R. H. Coverley - Production Engineer} MX.{John H Maddocks - Chief Proving Officer} | 3.8.37 | Agreed Mx.{John H Maddocks - Chief Proving Officer} Rm.{William Robotham - Chief Engineer} | 2.8.37 | Agreed Rm.{William Robotham - Chief Engineer} STAMP: J.S. 14 AUG | ||