Figs. 1,2,3,4,5 N.A.C.A. Technical Memorandum No. 815 Figure 2.- S.E.C.A.T. gyroscopic rudder control. Servo - control 'Z QE Figure 1.- Principle X of directional gyroscope, Servo-motor Servo-motors with oil pressure tank Vacuum^ i/ocuum pump 11 gouge Oil pump Figure 3.- Assembly sketch of Sperry… … ssed otr Elevaior v Comp re Figure 4.- Smith rudder and elevator control.
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