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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 the production inspection and testing of 20 HP and 40/50 HP dynamos.

Identifier  ExFiles\Box 165\6\  img185
Date  30th January 1929
  
X5661
EFC1/T30.1.29.
X581d
To BM. from EFC.
c. Mr. Brock.

20 HP. & 40/50 HP. DYNAMO
SPECIFICATIONS OF PRODUCTION INSPECTION & TEST

It will be remembered that when we changed to a 28 slot armature on the 20 H.P., we did not issue a new specification of production inspection and test, but issued a covering sheet EFC2/T30.8.27.

To put the matter in order we now issue such a specification (copy herewith).

You have now received the following specifications:-
(all of which refer to dynamos with 28 slot armatures)
(1) RR. standard 20 H.P. 28 slot dynamo as above.
(2) " 20 H.P. standard higher output dynamo. EFC1/T15.11.28.
(3) " Phantom dynamo of the N.B. type dated 19.12.28.
This is also applicable to normal S.S. dynamos whose rotation is opposite. A slight modification to this specification will shortly be issued.
(4) " Phantom dynamo of the higher output N.B. type, dated 4.12.28.

EFC.
  
  


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