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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).
The implications and required alterations for earthing the battery positive terminal.

Identifier  ExFiles\Box 130\2\  scan0325
Date  8th October 1936
  
G.W.H. Does this do the slightest good? Rms

Hs{Lord Ernest Hives - Chair}/Wst. By/RD.
c. Wcr. Hs.{Lord Ernest Hives - Chair} Ey. RUC.

E.4/HP.8.10.36.

Earthing of Battery Positive.

Confirming discussion of Hs{Lord Ernest Hives - Chair}/Wst. By/RD. and E.{Mr Elliott - Chief Engineer} on the above subject, it is agreed that Hs{Lord Ernest Hives - Chair}/Wst. will write to the battery makers, and find out what arrangements they are making to prevent corrosion of the battery fixing with an earthed positive.

It was also agreed that By/RD will look into alternative methods of fixing the battery with this new scheme.

With regard to other alterations required in the system, the starter motor needs no attention, nor any of the ignition gear.

The dynamo will require the brushes changing over, also field connection.

The regulator connections will require to be changed over, and the cutout switch, which means that the whole of the dynamo circuit has to be changed round to suit.

By/RD will look into the last mentioned modifications and it is then proposed when we are satisfied with the detail alterations to be made that experimental cars will be modified to test out this change.

B-23-AE chassis is running at the present time with a mock up scheme, in which the battery positive is earthed.

In conclusion we think the main advantage to changing this polarity is the reduction of voltage required at the sparking plug points, and the more improved consistent operation of the spark itself, also the effect of reduced operational voltage on ignition wiring.

E.{Mr Elliott - Chief Engineer}
  
  


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