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).
Technical memo about experiences with portable and stationary accumulator cells, focusing on maintenance, charging, and dynamo regulation.
| Identifier | WestWitteringFiles\D\March1920\ Scan20 | |
| Date | 18th March 1920 | |
| To PN.{Mr Northey} from R.{Sir Henry Royce} Copy to Ed.{J. L. Edwards} "" BN{W.O. Bentley / Mr Barrington} "" CK.{Mr Clark} "" H.S. "" H.{Arthur M. Hanbury - Head Complaints} ORIGINAL X.664 RE ACCUMULATOR CELLS. X.2676 X.294 X.607 X.1402 X.3526 I have had quite a little experience with cells at West WitteringHenry Royce's home town, both of the portable and stationary type. I find the portable type which is fitted on cars, very difficult indeed to maintain in a charged condition. I think this is largely due to surface leakage from the terminals, and it was for this reason that I condemned batteries with terminals having maximum volts close together (Lucas model). I suggested vaselining the whole top of the battery. This has been ruled out owing to the vaseline dissolving the sealing bitumen. We are bound to thoroughly vaseline the terminal and apparently the only thing to do is to thoroughly wash the battery occasionally with fresh water. The Chloride cells that we have been using appear to take a charge of 12 amperes, and even 15 amperes, very quietly. Regarding the heating of dynamos, and the difficulty of obtaining the large current at slow speed, I think as I pointed out some time ago, we shall get the best results by using the trembler form of regulation. The usual self-regulating dynamos (constant current) naturally produce a rather inefficient machine as regards heat, as well as preventing large charging current at slow speeds. We are proposing to build an experimental machine for vibrator regulator. You will notice that the Chloride Accumulator Co. strongly recommend the very small charging current trickling into the cell while resting. This is exactly what I meant in the garage equipment in all places where continuous current is available. R.{Sir Henry Royce} | ||