(a) 

 "Inclined wheel." The vertical 

 shaft at D is rotated by action of 

 wheels H and J on cam, or 

 swash plate, ABC. Boulton and 

 Watt tried this device but dis- 

 carded it. 



"D 



n 'I ^'" ■ f 



1 ^ r 



tj4 



Counterweighted crank wheel. 



(c) 

 "Eccentric wheel" with external 

 yoke hung from working beam. 

 The wheel pivots at C. 



194 



BULLETIN 228: CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



