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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).
Specifications for sealing Peto & Radford and Exide batteries.

Identifier  ExFiles\Box 38\5\  Scan361
Date  31th March 1925
  
X 33987

To Wd.{Mr Wood/Mr Whitehead} from EFC.
c. By.{R.W. Bailey - Chief Engineer}

EFC6/T31.3.25.

X. 4414P. PETO & RADFORD BATTERIES.

With reference to your Wd{Mr Wood/Mr Whitehead}2/NJ31.3.25, for a
long time now, ever since the Exide started sealing over
the tops of the old 40/50 Exide battery, we have not desired
of either battery,
the cells to be separately sealed in the sense that there
are divisions between the cells on the top. Possibly the
wording of our Specification is not very explicit on this
point, but it has latterly always implied that the cells
should be completely sealed over their tops "so as to
make a solid top", i.e. no cracks, as distinct from
filling up the whole of the interstices between the cells
and the case at the bottom.

The point was that the cells should be sealed up
sufficiently to keep the acid from these interstices but
not sufficiently to prevent the easy removal of single
cells when desired. This being the case, we do not
understand Messrs. P & R's statement that there is a
slight gap between neighbouring cells, because in those
batteries of theirs which we have, all the cells seem to
be completely sealed over as desired and no cracks between
cells appear on the top of the battery, at any rate
initially. They may develop in time, but it is certainly
our intention that the sealing compound shall be of such a
nature that the whole battery is effectively sealed over
  
  


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