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).
Causes of battery corrosion on the Phantom II chassis.
Identifier | ExFiles\Box 168b\3\ img035 | |
Date | 7th February 1930 | |
To FN. from EFC. c. H.{Arthur M. Hanbury - Head Complaints} X 7535 EFC1/ADL7.2.30. X.7535. BATTERIES ON PHANTOM II CHASSIS. We have received your further note ref. PN{Mr Northey}1/W115.2.30 asking for our opinion of the effect of increased ventilation over the top of the battery in the prevention of terminal corrosion. As in our experience, this matter is effected somewhat by whether a battery is of the P & R or Exide type, we had hoped to learn from you concerning which type the complaint was more particularly made. From our own observations the question of corrosion does not seem to be principally a function of the degree of ventilation, though insufficient ventilation may support corrosion where the conditions for its occurrence are otherwise obtained. We are of the impression that the corrosion which is now complained of has occurred on the P & R battery due to the presence of lead coated brass washers since the change of design of the cell lid{A. J. Lidsey} by which these washers became closer to the cell cover, and the vent hole being on the same level caused corrosion by allowing acid to collect round the terminal post washers. We have taken up this point with Messrs. P & R, and they are supplying on our suggestion, antimonial lead washers in place of the lead coated brass washers which have been in use hitherto. We had a similar trouble early on with the Exide battery due to the use of lead coated brass washers, but quite early we had this changed, and as we say it is our impression that this trouble does not occur on Exide batteries to any extent. The nuts, of course, are of lead coated brass, the links of lead coated copper, and provided the terminal fittings are properly covered in the first instance with pure vaseline, not grease as this contains impurities, corrosion should not take place at all. On the new 6-volt unit batteries a certain amount of ventilation must necessarily occur through the handle slots. It should also be noted that when the battery was mounted on the running board in the wooden box no | ||