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).
Report page detailing the construction and materials of P & R covers, links, and nuts for a battery or electrical cell.
| Identifier | ExFiles\Box 168b\3\ img023 | |
| Date | 2nd September 1929 guessed | |
| -3- thus making a solid acid tight joint. About .4" flange is allowed for sealing compound. P & R.{Sir Henry Royce} The P & R cover is of moulded "Dagenite" having a porcelain screw vent plug, and being provided with a special type of gland seal. This is in the form of a soft thick rubber gasket washer being a tight fit over each post. The cover is pressed over these and the rubber gaskets being forced into the recesses in the cover. Some difficulty was experienced in replacing the cover by hand, but I expect Messrs. P & R have special tools or machinery for this purpose. It would be interesting to know how they do it so that we could manage it if we had to dismantle any of these cells at any time. whilst hot & when cold shrinks onto the post & grips it tight, this A hard rubber sleeve or collar is put over the posts and drops in the cover flush with the top, it is then filled in with molten petroleum jelly thus giving two seals, one of rubber and one of petroleum jelly. At the same time allowing a certain amount of flexibility which is what is required because this saves a strain between the cover and the case and is less likely to give trouble due to the compound breaking away. There are two projecting strips on each strap and these fit in slots provided in the cover and so take part of the strain when the nuts are being tightened up. This may save a turning moment being put on the plate lugs. About .65" flange is allowed for sealing compound which would make a very good joint especially that bitumen will adhere better to Dagenite than ebonite. From all appearances I think the P & R cover is a better designed and stronger job. Links and Nuts. The cell to cell connecting links on both batteries are of the kinked copper (sheet) lead covered. The nuts are of brass lead covered. The P & R links are not so well lead coated as the Exide but are of a larger cross section being .037" x 1.25" as against .037" x 1.00". The nuts on both Exide and P & R batteries are a fairly good fit on the threads. There is little to choose or say as to which is | ||