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).
Operating conditions and performance curves for a 40/50 HP dynamo.
| Identifier | ExFiles\Box 61b\1\ scan0219 | |
| Date | 3rd June 1931 | |
| X6126 Hs{Lord Ernest Hives - Chair}/CAP. Copy to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} By.{R.W. Bailey - Chief Engineer} PN.{Mr Northey}1/WT3.6.31. 40/50 H.P. Dynamo. X6126 X6016 "eferring to your Hs{Lord Ernest Hives - Chair}/CAP1/AD29.5.31. 40/50 H.P. Dynamo intended to be used on N.2 series. It is not clear to me why the curve No.1 is shown in which a peak current up to 16 1/2 amps is developed when on battery only, in view of the fact that with the two- switch scheme the conditions of running would be either :- (a) Resistance in field circuit, battery in circuit only, no lights on. (b) Resistance cut out of field circuit, headlights in use and battery on charge. The curve No.1 would never be a help unless there were provided an additional point on the control- switch enabling the driver to overcharge his battery with no lamps on, in the way we wish to avoid. Probably the explanation is simply, but I fear at the moment it is not obvious, and shall be glad for your remarks. PN.{Mr Northey} | ||