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 disadvantages of a Tungstone sample cell, focusing on its weight, dimensions, and potential for leakage.
| Identifier | ExFiles\Box 35\4\ scan 172 | |
| Date | 20th January 1926 | |
| XJ830 To Wd.{Mr Wood/Mr Whitehead} from EFC. c. BY.{R.W. Bailey - Chief Engineer} EFC6/T20.1.26. X.3830 - TUNGSTONE CELL. ----------- Quoting in the main from my assistant's report, the following are our remarks as regards the sample cell which we have had for examination and test :- The first big disadvantage of this cell is its great weight-capacity ratio. It is estimated that a 12 volt 75 ampere hour battery would weigh with the necessary acid (which is more proportionally than in most cells) about 130 lbs, this being 20 lbs. more than our specification allows, and this is only estimated on the rated capacity, whereas it is possible that the actual capacity is somewhat less. Another disadvantage lies in the necessary dimensions of the battery. These are estimated, for a 75 ampere-hour battery to be 17" long x 11" wide x 7½" high (when arranged in two rows of three, i.e. the usual arrangement), in which case the width would be much too great, although the other dimensions would be O.K. It is our opinion that the cell lid{A. J. Lidsey} of die-cast antimonial lead would allow a certain amount of cell leakage (electrically) owing to the film of acid on the rubber insulator, particularly on the underside. Although it may be argued that a single cell does not | ||