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).
Electrical experimental record sheet tracking the mileage and condition of a main and auxiliary switch unit.
| Identifier | ExFiles\Box 64\4\ scan0313 | |
| Date | 3rd November 1930 | |
| ELECTRICAL EXPERIMENTAL RECORD SHEETS. Main and Auxiliary switch unit A.NO. (Sheet II) Date on. | Location. | Date off. | REMARKS. | Miles reading Start. | Miles reading finish. | Miles covered | Total miles. 3-2-30 | 19EX | | | | 17818 | 1940 | 11,122 17-3-30 | 19EX | | | | 18605 | 787 | 11,909 5-5-30 | 19EX | | | | 20379 | 1774 | 13,683 4-7-30 | 19EX | | | | 24791 | 4412 | 18,095 14-8-30 | 19EX | | | 00055 | 2260 | 2205 | 20,300 3-9-30 | 19EX | | | | 3493 | 1233 | 21,533 3-11-30 | Lab. | | Switch removed from chassis. | | 8841 | 5348 | 26,881 Condition very good in view of mileage. Wear had occurred at armature pivot pins. Contact condition reasonably good. | ||