The blueprint for a Phantom III instrument board dimmer switch.
| Identifier | ExFiles\Box 168a\1\ img049 | |
| Date | 22th September 1936 | |
| To IRC. c. Hs {Lord Ernest Hives - Chair} /Wst. c. Er-Br. {T. E. Bellringer - Repair Manager} r6135. BY {R.W. Bailey - Chief Engineer} /RD.1/B.22.9.36. "Phantom III" Instrument Board. We hand you herewith, blue print of R.R.Sch.991 - Dimmer Switch for Instrument Board Lights. Details will be issued in the course of a few days. This is a scheme in which Sg. {Arthur F. Sidgreaves - MD} is particularly interested, and has specially asked for this feature to be incorporated. BY {R.W. Bailey - Chief Engineer} /RD. | ||
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).