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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).
Letter from Peto & Radford to E. Fowler-Clark discussing battery capacity and offering a lighter 'Bull Dog' battery alternative.

Identifier  ExFiles\Box 38\5\  Scan283
Date  25th November 1922
  
X. 3398.

Works, Dagenham Dock, Essex.

TELEPHONE VICTORIA 3667. 4-LINES PRIVATE BRANCH EXCHANGE.

TELEGRAMS CONCENTRATION, SOWEST, LONDON.

Manufacturers of P&R Accumulators. Established 1889.

PETO & RADFORD

Proprietors - Pritchett & Gold and E.P.S. Company Ltd.

50 GROSVENOR GARDENS, LONDON. S.W.1.

DIRECTORS:
SIR ARCHIBALD G.GOLD
F.C.GRAHAM MENZIES
C.R.D.PRITCHETT
G.R.N.MINCHIN
T.W.PRITCHETT
WILLIAM PETO
DAVID WILLOCK.

YOUR REF.________
OUR REF. C./2511
25th Nov.1922

E.{Mr Elliott - Chief Engineer} Fowler-Clark Esq.,
11, Madeley Street,
Derby.

Dear Fowler Clark,

Thanks for yours of the 22nd inst. I have delayed answering this because I was going to our Works yesterday and had a chance of taking up matters with them.

I understand that the capacity of the B.D.11. is about 60 ampere hours, whereas the capacity of the Exide you are now using is about 55.

I am afraid that it would not be practicable to offer a B.D.9 as you suggest. Our battery and the Exide each have the same area and any reduction in area would probably bring the starting effort below that which you require. We think therefore that we must keep to 11 plates of this area.

Our battery has behaved better than the other on starting simply because there is more acid room in it, it has a better chance to give more discharge.

What we can do is this. We make the B.D. batteries with the thinner type of plate. We can offer an 11 plate "Bull Dog" battery with these thinner plates which would be in the same box as the present B.D.11. The capacity, owing to the thinner plates would be 55 ampere hours. The starting current would be quite as good as our present B.D. 11. The weight of the total battery would be reduced by about 6 lbs; there would be a ~~little more acid room~~ in each cell which would be an advantage. The life would not be quite so long as the B.D.11 but I think I can say with all confidence that it should be longer than that of your present standard battery.
  
  


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