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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).
Describing plots related to the variation of efficiency with helix angle and coefficient of friction.

Identifier  ExFiles\Box 67\4\  scan0335
Date  13th July 1927 guessed
  
VARIATION OF EFFICIENCY WITH HELIX ANGLE AND COEFF. OF FRICTION.

In fig V, tan(θ-Y) / tan θ is plotted for various values of θ, the helix angle, and Y, the angle of friction.

Fig 6 shows the same formula plotted for small angles of θ to a larger scale.

Fig 7 shows tan θ / tan(θ+Y) plotted, and is the same as the right hand side of fig V
  
  


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