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).
Continued report on battery accumulators, discussing terminal lugs, porcelain vents, and plate improvements.
| Identifier | WestWitteringFiles\H\November1921\ Scan35 | |
| Date | 25th November 1921 | |
| Contd. -2- EFC4/T25.11.21. recesses in the leaden lug which are afterwards filled with vaseline should be noted. Mr. Minchin stated that since the introduction of this feature, cases of corrosion of terminals were unknown. (4) Similar terminal lug with ebonite sleeve for ebonite accumulators, with recesses unfilled. (5) Sample porcelain vent. On previous P & R accumulators we had complained that their porcelain vents did not prevent the acid spraying out during charge, and Mr. Minchin agreed to this from his own experience. Therefore this vent is being improved by the addition of the celluloid trap and by making it of greater depth. It does not seem likely that this trouble will recur. These porcelain vents on a battery perhaps are a little unsightly; on the other hand there is the opinion that they brighten up the appearance. (6) Previous grid for both negative and positive plates, marked "BD{Mr Berend} negative". (7) Improved positive grid, marked "DB{Donald Bastow - Suspensions} positive". The feet on the bottom of these plates will be noted and the four supports on the bottom of the cell box on which the positive and negative plates rest alternately. The terminal shanks of these batteries are considered too small. The makers are prepared to increase these in future batteries. Both types of battery are complete pitched in over the cell tops in their cases. Mr. Minchin is an enthusiastic Rolls-Royce owner, and brought his car with him. He may be considered to use the car under average conditions and he stated that he had no difficulty whatever in keeping up the charge of the battery, if anything it was inclined to be charged too much. He uses, as an experiment, a composite battery of a number of various makes of cells, three of which are P & R cells of various assembly, and he keeps the charging switch on the E'K' 239V (100 J) (2'H' 198' 10-12-20) C' 2871 Contd. | ||