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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).
Typed letter from 'EFC' critiquing a proposal for an overcharge preventer.

Identifier  ExFiles\Box 31\1\  Scan211
Date  9th December 1929
  
X. 1402

MR. BROCK from EFC.
c. Wor.{Arthur Wormald - General Works Manager}
c. Hs.{Lord Ernest Hives - Chair}

EFC3/AD9.12.29.

RE - OVERCHARGE PREVENTER.

I have, today only, seen a copy of your note to R.{Sir Henry Royce} with Mr.Watson's description and diagrams attached to which R's note R1/M21.11.29 was an answer.

This being an electrical experimental suggestion, a copy ought to have been sent to me.

If you had put this to me directly, and as I have this problem constantly at my finger ends, I could and should have given you in writing a number of criticisms both for and against. I should also have submitted the matter to R.{Sir Henry Royce} if you had desired me to do so after having seeing my criticisms.

We ourselves have had an automatic overdischarge cut out working on very similar lines since Jan. 1924, by which we are enabled to leave a battery on discharge circuit overnight, the discharge curve being automatically recorded and stopped at the correct stage of discharge. My point in mentioning this is that a mere verbal statement without exact particulars of a device of this nature, gives us little or no more information beyond the fact that the apparatus is a load switching relay, which is very familiar to all electrically concerned. Applied to a chassis system, the exact details of connection and arrangement have a very important bearing on the functioning.

EFC.
  
  


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