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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).
Electrical specifications for a Weston Revs Per Minute Indicator, Model 267.

Identifier  ExFiles\Box 33\5\  Scan067
Date  13th October 1925
  
V1607

13.10.25.

X.1782 - WESTON REVS PER MINUTE INDICATOR INSTRUMENT MODEL 267. No. 37043. V1807

Millivolts for full scale deflection 520.

Milliamperes for full scale deflection 13.5.

Hence resistance of instrument 38.5 ohms.

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EFC.
  
  


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