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).
Burning of side lamp bulbs on the 20/25 HP model and proposing a multi-rate charging scheme to prevent battery overcharging.
| Identifier | ExFiles\Box 163\6\ img170 | |
| Date | 11th June 1932 | |
| X6016 To P. from E.{Mr Elliott - Chief Engineer} E.5/HP.11.6.32. c. Sg.{Arthur F. Sidgreaves - MD} Lor. By.{R.W. Bailey - Chief Engineer} Cx.{Major Len W. Cox - Advertising Manager} Ha/Wst. re Burning of Side Lamp Bulbs - 20/25 HP. Further to our memo E.6/HP/9.6.32, and referring to Ph.1/WT.9.6.32, we are loath to run the risk of overcharging the car battery to the extent of shortening its life, particularly as we should have to pay ourselves for any failure which occurred within the guarantee period of 3 years. We have in mind that the contingencies you mention might be provided for by adopting three rates of charge on the lines of the Lucas scheme. In this way there would be the following rates of charge:- (1) Summer daylight charging. (2) Winter daylight charging. (3) Summer S.and T. (4) Winter S.and T. (5) H.S. and T. (1) would have the full amount of resistance in the field fixed arbitrarily to give a suitable charging rate, so that the charge could always be on when the engine was running. This would replace the no-charge position on the switchbox. (2) and (3) would have part of the resistance only in the field with a suitably increased rate of charge, and an earlier cutting-in point. (4) and (5) would be at the maximum rate of charge, with no extra resistance in the field. No extra positions should be required for operating in this way on the switchbox. Ha/Wst is looking into this question at the moment, to see how the switching operations could be [STAMPED] 1932 JUN 18 | ||