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).
Internal request to order two double pole, double throw knife switches from the Sun Electrical Co.
| Identifier | ExFiles\Box 168a\2\ img119 | |
| Date | 20th September 1933 | |
| Roy.{Sir Henry Royce} From Ha/Wst. Ha/Wst./MA.20.9.33. Will you please order for us to order number S11, from the Sun Electrical Co., - Two double pole, double throw knife switches. These should be insulated against 250 volts, and we require one to be capable of carrying 30 amperes and the other 50 amperes respectively. Ha/Wst. | ||