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 log for various spark plugs, detailing results of mixture, insulation, oiling, and pre-ignition tests.
| Identifier | ExFiles\Box 33\3\ Scan096 | |
| Date | 20th January 1921 | |
| Header Row: -2- Date. Type 1st. Test. Over-strong mixture. 2nd. Test. Breaking down insulation. 3rd. Test. Over-Oiling. 4th. Test. Pre-ignition. Test Bed. No. fitt: No. failed Remarks. Row 1: Date: 14.1.21. Type: Herz. 2 pt. ribbed. 1st Test: missing. 2nd Test: O.K. 3rd Test: failed No. fitt: 6 No. failed: 2 Remarks: right out - mica plugs will not clean. Row 2: Date: 14.1.21 Type: Herz. 1st Test: missing 2nd Test: O.K. 3rd Test: failed No. fitt: 6 No. failed: 2 Remarks: " " " Row 3: Date: 15.1.21 Type: Equem 1st Test: O.K. 2nd Test: O.K. No. fitt: 6 Remarks: Miss-fire at high speeds. Row 4: Date: 6.1.21 Ref: 201220 Type: Champion. 1st Test: O.K. 2nd Test: O.K. 3rd Test: O.K. 4th Test: leak O.K. No. fitt: 6 No. failed: 0 Remarks: Fitted to 2.EX. Row 5: Date: " Type: " 1st Test: O.K. 2nd Test: O.K. 3rd Test: failed. 4th Test: O.K. No. fitt: 6 No. failed: 2 or 3 Remarks: " " Goshawk. Row 6: Date: " Type: " 1st Test: missing No. fitt: 6 No. failed: 3 Remarks: " " EP{G. Eric Platford - Chief Quality Engineer}'S CARS (Magneto weak). Row 7: Date: 19.1.21 Type: Fan-flame 1st Test: missing slightly 2nd Test: o.k. 3rd Test: o.k. Row 8: Date: 20.1.21 Type: Appoll O 1st Test: " " 2nd Test: ? Footer Text: R.R. 599 (250 T) (SD176 19-7-17) M.P.8686 | ||