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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).
Particulars of a Johnson & Phillips rectifier for charging 12-volt batteries and comparing it to a B.T.H. Tungar rectifier.

Identifier  ExFiles\Box 32\5\  Scan014
Date  29th November 1922
  
To R.{Sir Henry Royce} from EFC.
c. CJ.
c. Ds.

X1589
EFC1/T29.11.22.

X.1589 - RE J.{Mr Johnson W.M.} & P. RECTIFIER.

Herewith please receive as requested full particulars of Johnson & Phillips rectifier for the purpose of charging 12 volt batteries on A.C. mains.
Experimentally, a series of comparative tests between this and the B.T.H. Tungar rectifier have been carried out by Prof. Cremp at Birmingham University, and I believe the results of the test will be published. In the meanwhile, however, one would judge from the results so far as we have heard of them, that his own impression would be that the Johnson & Phillips converter is a more satisfactory apparatus, though of course it is impossible for him to give expression to such an opinion.

Would it be worth while our obtaining one of these rectifiers for experiment so that we can definitely recommend its use to customers ?

EFC.

JAE.69698. 28th Nov.
and Booklet att.
  
  


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