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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).
Technical memo comparing the P & R Battery Type BD.11 to Exide batteries, detailing its construction and advantages.

Identifier  ExFiles\Box 38\5\  Scan268
Date  14th November 1922
  
To R & E.{Mr Elliott - Chief Engineer} from EPC.
c. CJ. & FN.
c. By.{R.W. Bailey - Chief Engineer} & EP.{G. Eric Platford - Chief Quality Engineer}
c. Rg.{Mr Rowledge} & Da.{Bernard Day - Chassis Design}

X3398

EFC1/T14.11.22.

X.3398 - P & R BATTERY TYPE BD.{Mr Berend}11 BATTERIES FOR 40/50.

The above batteries as compared with the Exide incorporate so many desirable features in comparison with those others, that we make no apology in again putting before you the facts of the case. You may remember that we have had three of these batteries for experimental test.

Points about the P & R BD.{Mr Berend}11 Battery.

(1) Lead of the very greatest possible purity is used.

(2) The plates, after being pasted, are allowed to dry in an ordinary atmosphere for some weeks before the forming process is developed. This is considered to be much superior to the methods of other battery makers, in which the drying is forced.

(3) The plate grids are made with particularly robust outer frame and the grid section is of such a form - triangular bars with their vertices pointing inwards alternately right and left - that the paste cannot fall out. A very slight reduction of effective paste area thus occurs but it is considered to be negligible in view of the other advantages gained.

(4) The plates are of the thick type, making for durability and long life.

(5) Both positive and negative grids are fitted with pairs of feet in such a manner that the positive and negative plate sections are independently supported by two pairs of ribs moulded in the cell case, thus short-circuiting by accumulation of sediment at the points of support of the plates is avoided.

(6) The separators are of wood but much thicker than those used in the Exide cells and ribbed on both sides in contact with the plates. Owing to increased thickness of plates and separators short circuiting by buckling is nearly impossible.

Contd.
  
  


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