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 {Mr Griffiths - Chief Accountant / Mr Gnapp} /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 | ||
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).