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).
The performance and testing of various batteries, including models from Tudor, De Martin, and Exide.
| Identifier | WestWitteringFiles\G\June1921\ Scan88 | |
| Date | 2nd June 1921 | |
| Contd. -2- EFC4/T2.6.21. We have written to the Tudor Company enumerating the points in which these batteries still do not agree with our specification, pointing out that the remaining batteries sent to our expl. order should be modified accordingly. Battery No.59. De Martin. This is an interesting battery owing to the extravagant claims made for it by its producers. (See our EFC3/T7.3.21 in this connection and for description see also EFC2/T6.4.21). It has done only moderately well on our tests, but shows a decided tendency towards improvement as it has shown a steady increase in capacity on successive low rate discharges. Further experimental observations will be made upon it. Battery No.60. U.S.A. Exide 6 LXR/9/1. This battery is very similar to the British Exide except for the fact of having burnt up connections. It has done well on our tests. It will be noticed that the internal resistance of the battery is rather high. It is suggested that this battery be put on 7 CA. Battery No.61. Exide 6BXE5 with separately supported positive and negative plates (New R.R.Standard). This battery has done quite well on the tests. The efficiency appears less than that of the previous 6 BX 5 batteries, but owing to the increased thickness and reliability of separation, and the rounding off of the plates at the corners, it is expected that the loss of efficiency will be Contd. | ||