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).
Short internal memo confirming that an Insulating Switch has been fitted to chassis 49 GB.
| Identifier | ExFiles\Box 31\2\ Scan019 | |
| Date | 21th April 1915 | |
| G21415 Mer R.{Sir Henry Royce} C.J. 21.4.15. Da{Bernard Day - Chassis Design}1/G21415. In reply to your letter to Mr. Johnson - RL/IB19415 re the Insulating Switch, this has been fitted to 49 GB for some little while now. Da.{Bernard Day - Chassis Design} [Signature] | ||