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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 suggesting improvements to battery design, comparing P & R and Exide types, specifically regarding plates and separators.

Identifier  ExFiles\Box 168b\3\  img024
Date  20th December 1929 guessed
  
-4-

the better battery as far as appearances go, but
the P & R has two advantages over the Exide in the type
of grid and design of cell cover, which I think are distinctly
better.

There are two things with regard to the P & R
which I think should make some improvement.

(1) The positive plates would be, we think, better
if thickened up a little bit, even if at the expense of
the negatives.

(2) The ebonite separators should be thickened up
a little if only to .45 or .50 mm. They should also be
larger and be of the same size as the wood so as to
project over the plates to the same extent.

At present they are on the small side and do
not even come to the edge of the plates, and if any
buckling occurred (which at present, I may say, is almost
unknown) they would not prevent a short circuit because
there would be only the wood to pinch through to make contact.

I suggest these improvements provided they do
not upset the characteristic of the cell such as charging
resistance etc. and so worsen its general good performance.

I also suggest that the Exide Co. make their
plates a little less wide for the same reason that the
P & R plates are better in this respect.

EFC/GJ.
  
  


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