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 a Sequence Starter (S.S) duplex push button switch.
| Identifier | ExFiles\Box 64\4\ scan0265 | |
| Date | 3rd March 1929 | |
| X7655 ELECTRICAL EXPERIMENTAL RECORD SHEET Date:- 3-3-29. Sequence Starter (S.S) duplex push button switch. A.{Mr Adams} Date on. | Location. | Date off. | REMARKS. | Miles reading Start. | Miles reading finish. | Miles covered | Total miles. 25-2-29 | lab. | | Received for test. Tested on lab rig 14-4-29 | " | | Operation very poor. Failed due to bad springing of contacts. 16-4-29 | Shop. | | Sent into shop for repair and modification. 19-4-29 | lab. | 6-5-29 | Received back again fitted with bow spring D72168. 6-5-29 | 9EX | | Fitted to 9EX. | 9591 This switch is now superseded by one of modified design. | ||