WATT'S ROTATIVE ENGINE. 



The lower figure shows the earliest type of mechanism through which Watt 

 applied his engine to other uses than that of pumping. The so-called sun-and-planet 

 gearing, through which rotary motion was attained, is seen at the lower right-hand 

 corner of the figure. The upper figure shows a later and much improved type of 

 the Watt engine, in which the sun-and-planet gearing has been supplanted by a 

 simple crank. 



