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).
Log of tests and remarks on ignition components from various firms.
| Identifier | ExFiles\Box 35\6\ scan 089 | |
| Date | 18th August 1921 | |
| Ref. letter. | Firm. | Contacts or rods. | Description. | Date. | Remarks. AC | Fansteel Co. | C | Tungsten contacts fitted by Fansteel Co. | 18.8.21 | Handed to Hr. for school car to repl Z. Failed after 2000 miles. (Marked 4) AD | " | " | " | 13.8.22. | Run with earthing connection to cond ser. Reptd. in AB.18 (Marked 4) AE | " | " | " | 13.8.21. | Run with rubbing action. Reptd in AB.18 (Marked 4) AF | " | " | " | 7.11.21. | See Rept. AB.29. 7/11/21 Reptd PB44. 24/7/22 (Marked 4) AG | " | " | " | | (Marked 5) AH | C. Melin & Co. | " | Fitted by Melin & Co. to R.R.Std.B.ignition blade and screw. | 16.8.21. | Running under std. conditions. Reported. (Marked 5) AI | " | " | " | 19.9.21. | Points cracked. No good. (Marked 5) AJ | " | " | " | | Handed to RHC.{R. H. Coverley - Production Engineer} for scrubbing action for Expl. Car. Lost. (Marked 5) AK | " | " | " | Jan/22. | Handed to Col. Hr. for Demon. car. Retd. Pip formed. 289.20. | ||