WATT'S EARLIEST TYPE OF PUMPING ENGINE. 



The lower figure shows the ruins of Watt's famous engine "Old Bess." 

 The upper figure shows a reconstructed model of the "Old Bess" engine. It 

 will be noted that the walking beam is precisely of the Newcomen type. In 

 fact, the entire engine is obviously only a modification of the Newcomen 

 engine. It had, however, certain highly important improvements, as de- 

 scribed in the text. 



