VAIIlol'S INVKNTIOXS. 35 



surface condensation, as ready to convey itself from 

 mine to mine or from farm to farm, and to join in 

 performing labourer's work, even to boring and con- 

 veying rock by land or sea, as the most perfect of 

 modern engines ; and yet this unadorned engine, as 

 seen in the agricultural engine of the following chapter, 

 followed the excellent mechanism of the double-acting 

 Kensington model of 1798, and the still more beautiful 

 engine of the 1802 patent and London locomotive. 



o 2 



