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 a coil with a specially built-up primary winding.
| Identifier | ExFiles\Box 69\1\ scan0185 | |
| Date | 11th February 1929 | |
| X8710 ELECTRICAL EXPERIMENTAL RECORD SHEETS. SP{Mr Spinney}5 X. No:- 8710 Coil with specially built up primary winding | on. | Location. | Date off. | REMARKS. | Miles reading start. | Miles reading finish. | Miles covered. | Total miles. | |---|---|---|---|---|---|---|---| | 26-8-27 | lab | 31-8-27 | Received in lab. | | | | | | 5-9-27 | 8EX | | fitted to chassis 8EX | 1837 | | | | | 5-10-27 | " | | (Manchester wound coil) | | 2584 | 747 | 747 | | 4-11-27 | " | | Finer Primary- | | 3027 | 443 | 1190 | | 9-12-27 | " | | | | 4511 | 1484 | 2674 | | 7-1-28 | " | | | | 5451 | 940 | 3614 | | 6-2-28 | " | | | | 7157 | 1706 | 5320 | | 5-3-28 | " | | | | 7886 | 729 | 6049 | | 12-4-28 | " | | | | 9917 | 2031 | 8080 | | 7-5-28 | " | | Speedometer changed | | 737 | 820 | 8900 | | 6-6-28 | " | | " | | 2194 | 1457 | 10357 | | 4-7-28 | " | | " | 0002 | 3043 | 3041 | 13398 | | 13-8-28 | " | | Speedometer changed | | 6055 | 3012 | 16410 | | 29-8-28 | " | | " | 1115 | 7267 | 1212 | 17,622 | | 8-12-28 | " | | Car Handed to repair dept. | | 6431 | 5316 | 22,938 | | 31-12-28 | " | | " | 7267 | 8466 | 1199 | 23,137 | | 6-2-29 | lab. | | Coil removed and returned to lab. Unwound and examined. Found to be in excellent condition with only slight signs of heating. | | | | (Total 23,137 is double underlined) | | 11-2-29 | " | | | | | | | | ||