208 HYDRAULICS, 



agree very well with its construction. But as there 

 is no plate to accompany his description, we are 

 entirely unacquainted with the particular mode in 

 which he applied the power of steam. It does 

 not appear, however, that he met with sufficient 

 encouragement ; and this useful discovery was 

 long neglected. 



Towards the end of the century, captain Savary, 

 a person of great ingenuity, having probably seen 

 the account of the Marquis of Worcester's inven- 

 tion, was convinced of its practicability, and suc- 

 ceeded in constructing a machine of this kind. 

 He obtained a patent for the invention, and erected 

 several steam-engines which he described in a book 

 entitled " The Miner's Friend" published in 

 1690. 



The following is the description of his machine, 

 as improved by himself : 



a (Plate 10. fig. 1.) is a strong boiler for water, 

 built in a furnace. From the top of this boiler 

 there proceeds a pipe, b, which conveys the 

 steam into another strong vessel, r, called the re- 

 ceiver. This pipe has a cock at c, called the steam- 

 cock. In the bottom of the receiver is a pipe S, 

 which communicates with the rising-pipe H n k a 

 the lower end of which is immersed in the well 

 from which the water is to be raised. Immediately 

 below the place where the pipe S enters the rising- 

 pipe, there is a valve, n, opening upwards. A 

 similar valve is also placed at ?', above the pipe S. 

 Lastly, there is a pipe e, which branching off from 

 the rising-pipe, enters the top of the receiver. 

 This pipe has also a cock, d, called the injection- 

 cock. The mouth of the pipe e has on the end f 

 a nozzle, pierced full of holes, pointing from a 

 centre in every direction. The keys of the two 



is 



