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).
Chassis electrical system, focusing on battery size, charging issues, and specific components like the Danger Lamp and Auto Switch units.
| Identifier | WestWitteringFiles\R\2October1927-November-1927\ 40 | |
| Date | 25th October 1927 | |
| To R.{Sir Henry Royce} from EFC. c. BJ. E.{Mr Elliott - Chief Engineer} c. Da.{Bernard Day - Chassis Design} Wor.{Arthur Wormald - General Works Manager} c. Ev.{Ivan Evernden - coachwork} ORIGINAL EFC1/T25.10.27. X.8780 X.4008 X.4040 R.R. CHASSIS ELECTRICAL SYSTEM. Danger Lamp Unit. (Green lamp scheme, or alternatively thermal switch of the Mentor type but with four terminals). Auto Switch Unit. Yours refs. R3/M5.10.27 and RL/M11.10.27. We do not agree regarding the use of smaller batteries with our system as at present arranged, but only if or when either - (A) we can see our way to reduce the output of dynamos considerably (in which connection see our report EFC3/T12.10.27, also further remarks lower down concerning the amount of charge). or (B) We standardise some form of auto charge reducer. This is from the overcharging point of view. We are not aware of the fact that bigger batteries are being fitted to RR. cars for theatre work and parking. We agree that if it does occur that batteries run down in these circumstances, it is most probably a question of insufficient charge. This, because it would be impossible for a fully charged battery (not old enough to need renewal) to go low on the side and tail lamps only within 10 hours, except in the unlikely xxx case of the elements of a battery having been ruined by the battery having been allowed to stand out of use without charge. Hence, if a battery is found to run down on side and tail lamp lighting, since it may be assumed that it was at one time put on the car in a fully charged condition, the inference can only be that the charge is insufficient. Contd. | ||