Transactions Society Naval Architects and Marine Engineers, Vol. 30, 1922. 
To illustrate paper on “Automatic Steering,” by Elmer A. Sperry, E. 
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Fig. 11. - Steering by hand and by automatic in heavy weather, the 
chart at right immediately following the one at left, 
same scale, Note the automatic holds the ship very close- 
ly on her course, averaging less than one half of a degree 
either side, 
