Fig. 3. Camera vessel is shown with one-half the ball 

 fairing removed. The worm and ring gear 

 assembly which operates the vertical scanning 

 is indicated by the number 1; the cradle sup- 

 porting the camera housing by number 2. 



CONTROL CONSTRUCTION 



Movable Components 



A vertical pedestal type hollow tube sealed shaft and bearing 

 assembly entered the center of the floor plate flange (figs. 1 and i|b) . 

 The pedestal was 6" high with a wall thickness of 3/l6" and bore of 2", 

 Oil impregnated bearings 2" diameter x 1-1/2" long x 1-1/2" bore were 

 pressed into both ends to form a support for the main drive shaft and 

 a vertical thrust surface for support of the lower yoke assembly. A 

 square groove I/8" x 2-l/ii" diameter was cut in the outside of the 

 lower face of the bottom bearing for insertion of a I/8" x 2-l/i4." dia- 

 meter rubber "0" ring which sealed the main shaft. A secondary water 

 seal was made by installing another I/8" x 2" "0" ring in a similar 

 groove 3/8" from the lower face of the bottom bearing (fig. 1). The 

 horizontal drive ring -gear served as a vertical thrust bearing and 

 supported the entire lower yoke assembly (fig. he). This ring gear 

 was held in position by two through-thread Allen set screws placed so 

 that a positive pressure was exerted on the lower "0" ring seal face. 

 This positive pressure compressed the "0" ring about .010" and was 

 effective with a minimum of .002" depression. With the slow scanning 

 speed of 1 R.P.M. the thrust should not need adjustment within the 

 life of the mechanism. 



The vertical scanning drive shaft was sealed at its lower end 

 by use of a standard spring loaded mechanical seal. It was supported 

 by bronze bushings at either end which were pressed in the hollow 



