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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).
Instruction sheet detailing the investigation of faulty 20 HP 57 Segment Dynamos.

Identifier  ExFiles\Box 57\2\  Scan106
Date  3rd November 1927
  
RR 238 (50 BKS.) (SH57.29-6-20.) MP 224358
X5783 do
ROLLS-ROYCE LTD.
INSTRUCTIONS.
To EFC.
Order No. AC. 95.
Customer's No. X 5783 do.
3. Nov. 1927.
20 h.p 57 Segment Dynamos
Returned as Faulty.
Four of these machines have been received altogether, only one of which might be supposed to have failed owing to insufficiency of temperature margin in normal running. Particulars are as follows:-
No 1676. (EFC 2/T. 22.12.26.)
No electrical fault found. Solder OK. Machine returned.
No 1749. (EFC 2/T 30.4.27)
This is the one machine which might have failed in normal running. Cause given as probably due to fault in external circuit. Commutator as though subjected to over-voltage.
Solder run.
Signed
This Sheet must be filed on completion of the work.
  
  


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