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).
Experimental record sheet for the E.H.C. M+R Switch A, tracking testing, modifications, and mileage.
| Identifier | ExFiles\Box 64\3\ scan0209 | |
| Date | 10th November 1924 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS E.H.C. M+R Switch. A X. No. 8650 X8650 Date on. | Location. | Date off. | REMARKS. | Miles Reading start. | Miles Reading finish. | Miles Covered. | Total Miles. 25-11-24 | Lab. | 1-11-24 | Recd from shop. Tested. H.O. coil weak. Taken to W.W. | — | — | — | — 1-11-24 | 93NK | 17-11-24 | Taken off at W.W owing to failure of other parts of Starter gear | — | — | — | — 17-11-24 | Shop. | 1-2-25 | Coil cores packed up. Hold off coil rewound with 27 S.W.G wire. No of turns on heavy winding reduced. | — | — | — | — 1-2-25 | Lab. | 29-10-25 | Resistance measured at 18°c + 45°c. Prodn. tested. | — | — | — | — 29-10-25 | " | 31-10-25 | Tested in conjunction with C motor. | 0 | 20 | 20 | 20 31-10-25 | 9 Ex. | 12-11-25 | Sent into shop for fitting to car by F.F.H. Speedometer changed. | 8,261 | 8,870 | 616 | 636 12-11-25 | " | | Speedometer again changed. | 0 | | | 2-1-26 | " | | Reading taken. | 1,428 | 2,261 | 833 | 2,064 2-2-26 | " | 27-2-26 | " | | 2,895 | 634 | 2,897 27-2-26 | Lab. | | Taken off owing to failure of M S contacts (Heavy current contacts badly burned.) | | | | 3,531 27-2-26. Finished as switch has been replaced by one of modified design. 10.11.24. | ||