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 for the Phantom III instrument board to use 3.5 volt bulbs in series to achieve financial savings.
| Identifier | ExFiles\Box 168a\1\ img064 | |
| Date | 12th January 1937 | |
| 61357 Re-HDG c. Rm{William Robotham - Chief Engineer}/Wst. BY/RD.1/B.12.1.37. "Phantom III" Instrument Board. Sec.7190. R.R. Scheme 1041. We propose to use 3.5 volt bulbs in series, as an experiment, and to do this, lamp holders are required consisting of :- D.75875 - Contact -(Outer.) 8 off. D.75876 - Link. 8 off. D.75877 - Contact Spring. 8 off. Standard Parts required :- DB.{Donald Bastow - Suspensions}314 - Lamp Casing. 8 off. DB.{Donald Bastow - Suspensions}317 - Insert. 16 off. D.50483 - Washer. 16 off. D.1342 - Spring Washer. 16 off. D.1223 - Screw. 16 off. The bulbs for these lamps have been handed to Rm{William Robotham - Chief Engineer}/Wst. Assembly - D.75884. Blueprints of the new pieces are attached herewith. Please put one set in hand. The use of these small voltage bulbs in series, represents a definite financial saving. [Illegible handwritten note] BY/RD. | ||