Figure z 
'Datatech' rotary 
incremental encoder and 5:1 
Tufnol gear fitted to 
existing mounting bracket. 
127 
1 
; 
: 
; 
; 
  
  
Figure 2 
Mounting bracket and gear 
wheel already fitted to 
Thompson-Watts Mark II 
plotter by manufacturers 
to take encoders. 
  
Figure ^ 
Close-up view of end of 
drive shafts. The knurled 
knobs were removed to 
reveal 8 mm shafts.