100 BIOGRAPHICAL NOTICE. 



nical difficulty overcome, and the obscurity thrown over 

 the whole, leaves little or no doubt that Dymock had 

 deluded himself, and disappointed Hartlib in this one 

 particular instance, obliging him to express himself 

 candidly to the philosophical Boyle, — "as to his 

 Invention of Motion, of which I am no more so fond 

 as I was wont to be j'^ — that is, dating from 1651 to 

 1654. 



It is important to explain this fully, in order that 

 this project of " Engines of Motion*^ may be placed in 

 a true light in future histories of the Steam Engine, 

 with which great invention it has not the most remote 

 connection. Nothing, indeed, but its mysterious details 

 and character could have justified the assumed relation 

 between the two in former publications. 



