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).
Dynamo coil turns and the relative desirability of 48 watt versus 60 watt bulbs.
| Identifier | ExFiles\Box 62\3\ scan0087 | |
| Date | 7th January 1931 | |
| X6004 EFC. c. E.{Mr Elliott - Chief Engineer} By.{R.W. Bailey - Chief Engineer} c. Wor.{Arthur Wormald - General Works Manager} Sg.{Arthur F. Sidgreaves - MD} X.6004. EFCl/AD6.1.31. PN{Mr Northey}4/PH7.1.31. X.6089. Would you remind me please what there is in the 48 coil medium output dynamo which enables cutting in earlier; are there more turns? The point made at the end of your memo as to the relative desirability of the 48 watt bulbs or 60 watt bulbs is quite worth consideration. It is, of course, most unfortunate, that the difference in PD. with a fully charged battery - (a) when it is being charged. (b) when it is just discharging is so great. It would appear that in the case of our using the 60 watt bulb when giving a good light they would be mostly running at a too high voltage for long lighting. PN.{Mr Northey} | ||