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).
Performance and specifications of various car batteries.
| Identifier | WestWitteringFiles\H\March1922\ Scan27 | |
| Date | 2nd February 1922 | |
| To R & E.{Mr Elliott - Chief Engineer} -2- EFC1/TB.2.22 (Contd). Curves 48 and 55, sheet L, and 62, sheet K, refer to standard Exides with modifications, and show how the cranking ability has been reduced by the addition of ebonite separators for reliability. N.B. Our specification for the 40/50 battery requires this current to remain above 104 amperes for a period of 3 minutes. A * is shown on the curves, which the curve, to pass our specification, should clear. Curves 59, sheet K, and 59, sheet L refer to the De Martis battery and indicate the improvement that has taken place with use. This battery is still being subjected to certain tests to prove or disprove its immunity from bad treatment. Curve 60, sheet K, refers to the U.S.A. Exide 6-LXR-9-1 battery and shows the cranking ability of this to be approximately similar to our present standard. Curves 64, sheet L, refers to the 40/50 size of C.A.V-Willard, one of which we have on the School car at the present moment. Curve 66, sheet M, refers to the latest R.R.Tudor battery, two samples of which we received, as reported in our EFC1/T23.6.21, but which has turned out to be of unsuitably high resistance. Mr. Northey, however, is running one of these on his Trials Car. Curve 74 refers to the most recent P & R battery, three of which we have of type E.D.11. We have two of these in working order on experimental cars, both of which are giving excellent results. Finally, curve 102 refers to the most recent sample Exide battery, only received by us on Monday and put on this particular test yesterday. This battery has been submitted to us by the Chloride Company on their own initiative as meeting all the points of our specification with regard to reliability, cranking ability, etc., except that of weight. They do not consider it possible to meet our specification completely. In this connection we attach for your information copy of the letter received with this battery from the Chloride Company. We understand the position of the 40/50 to be that the last contract has been completely delivered up and that we do not require any further batteries for 6 weeks' time. Contd | ||