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 and service log for coil type PP, number 2.
| Identifier | ExFiles\Box 49\5\ Scan046 | |
| Date | 27th March 1923 | |
| COIL RECORD. Coil Type:- PP No:- 2 X No:- 4273 Date. | Service on. | If on car miles run. | If on test notes re use. | Total miles run. | Remarks re performance. 15-8-23 | Received from production | — | — | — | Std coil (stabilite) but with layer of paper between layers of primary winding. 21-8-23 | Bench test | — | General test | — | Coil broke down between end of secondary and primary terminal through varnish between coil & case. Retd to production. 24-8-23 | Received from production | — | — | — | 26-8-23 | Bench tests | — | Temperature tests | — | Tests to ascertain effect of temperature on material of case. See report PB114. 19-6-24. | | | Job completed. | (coil now obsolete) | 27.3.23. X.4273 | ||