Fig. iia. View of drive motor assemb- 

 lies. Arrow indicates 

 vertical limit switch cam. 



Fig, lib- "View of drive mechanism. 

 Arrows indicate bearing 

 housing pedestal and wiring 

 terminal strip. 



Fig. Uc View of control mechanism showing vertical limit 

 micro-switches. Horizontal worni and ring gear 

 drive assembly is indicated by arrows. 



