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).
Merits of six-volt versus twelve-volt electrical systems following Mr. Bijur's visit to the works.
| Identifier | ExFiles\Box 168b\2\ img041 | |
| Date | 26th August 1920 | |
| x802 To EFC. from R.{Sir Henry Royce} Copy to CJ. " " Hs.{Lord Ernest Hives - Chair} " " PN.{Mr Northey} " " R.R. of America Incor. (For the attention of OY.) X.802. X.3231. X.654. X.4162. X.1369. X.294. RE MR. BIJUR'S VISIT TO THE WORKS. I have not yet had the chance of seeing the defective vibrator regulator which was sent over with a suggestion that it should be used for R.R. cars. I do not think that Mr. Bijur's arguments for and against a six and twelve volt circuit are really consistent. It is equally difficult to know whether we ought to follow the six volt or twelve volt movement, our previous impressions being that there was a tendency in the States to adopt a twelve volt system instead of the six volt. Mr. Northey, and all the English makers, and apparently most of the French makers, are still in favour of twelve volts. My own impression is that six volts is extremely low, and results in very heavy conductors for the wiring of the car, especially as regards the motor circuit. The lamps too, one would think, were less satisfactory, owing to the metal filament being so very short and rigid. As regards the weight of the battery, there should be no difference except in the slight increase in the weight of the containers. The extra weight of the six containers over the three would be quite balanced by Contd. | ||