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).
List of experiments and modifications for the 20-HP Chassis.
| Identifier | ExFiles\Box 57\1\ Scan215 | |
| Date | 4th December 1925 | |
| 20-HP CHASSIS EXPERIMENTS. (5770) BY/HEBS/M 4.12.25 21.11.23. Improved Rear Support Bracket for F52880/1. Battery in Frame. "N"Sch:970 revised. 8.2.24. Petrol Tank with Reserve Compartment. F.52991. Hs.{Lord Ernest Hives - Chair}'n. Instructions 18.4.25. Metal Battery Box. L.O.P. F.53316. EPC.'s Instructions 30.9.25. Body Sub-Frame. F.53821. "N"Sch:1986. 7.11.25. Steering Box with large Worm and Outside Pendulum Lever. F.53935. "N"Sch:2065. 10.11.25. Front Road Spring with modified distribution of Metal. F.53859. "N"Sch:2074. 17.11.25. Side Steering Tube to suit Outside Pendulum Lever. F.53936. "N"Schemes 2066 & 2067. 28.11.25. Front Shock Absorber to suit new Side Steering. F.53942. "N"Sch:2066. 30.11.25. Steering Box with large Worm and Inside Pendulum Lever(Conversions) F.53970. "N"Sch:2062. BY/HEB.{H. Biraben} 4.12.25. HEB.{H. Biraben} | ||