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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).
Continued discussion on irreversibility and efficiency related to 'joggles' and 'parking', including a table of typical measurements.

Identifier  ExFiles\Box 68\1\  scan0026
Date  19th July 1927
  
contd :-
-3-
In Hs{Lord Ernest Hives - Chair}/Rm{William Robotham - Chief Engineer}2/LG19.7.27 we shewed the unfortunate state of
affairds where μ for joggles is so very low that irreversibility
does not count. For parking μ is high so irreversibility
does count i.e. make parking difficult and does not help in
joggles.

Typical Actual Measurements.

EFFICIENCY.

.720 .940
Parking 55% 65.6%
Joggles. 72.5% 72.2%

Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}
  
  


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