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 thickness of ebonite separators in Exide batteries and comparisons with those from P & R.
| Identifier | ExFiles\Box 54\5\ Scan033 | |
| Date | 28th August 1925 | |
| EFC {E. Fowler Clarke - Electrical Engineer} 2/T28.8.25. -2- Contd. At the conference, the pressure which I brought to bear upon them on the question of the division of the extra cost has resulted in the present offer which to me appears very reasonable. There arises from this the question of the thickness of the ebonite separators which we are at present receiving in the Exide batteries. We have not got the experimental evidence from Exide batteries that we have got from P & R, because we have had no test batteries for intensive tests of the new type in the same way as we have had from P & R, and in no case yet of either Exide or P & R have we heard of a failure of the new standard type of cell. There has not been time for such to occur in batteries used in the ordinary way. We have, however, opened up one of the new Exide cells for the purpose of inspecting the ebonite separators and we find this to have a thickness of .5 mm. i.e. precisely half way between what P & R are at present and what we are proposing to the P & R. {Sir Henry Royce} There is therefore no immediate cause at the present juncture to put pressure upon the Exide Co. to increase their separators by the slight amount of .1 mm., though when the results of Exide batteries which are at present going through intensive life tests are available, we may in this case also decide that technically it would be desirable to further increase the Exide separators. We should mention that the Exide separators have already been increased from .4 mm (the thickness used in the old type of cell) to .5 mm, as at present. EFC. {E. Fowler Clarke - Electrical Engineer} | ||