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).
Proposal to use 3.5-volt bulbs for the Instrument Patch on 25/30 HP & Phantom III Chassis to make economies.
| Identifier | ExFiles\Box 168a\1\ img091 | |
| Date | 1st July 1937 | |
| c.c. Rm{William Robotham - Chief Engineer}/Wst. 613? BY/RD.6/B.1.7.37. 25/30 HP. & Phantom III Chassis. To enable us to make economies on the Instrument Patch we propose to use 3½ volt bulbs, which arrangement Rm{William Robotham - Chief Engineer}/Wst., has already tested and approved, and we now issue RR.Sch.1102 showing the mounting of the fixed resistance, utilising standard Lucas units. The scheme also enables us to use a more economical lamp assembly for the 8 lamps in the patch. Details of this will be issued almost immediately and we should be pleased if Pm/Wst., could arrange for an early test. Blueprints of the scheme attached herewith. BY/RD | ||