334 Mr. Perkins^ Method of applying his New Invention 



ry to shew in this drawing) and the weight on the handle oi 

 the pump I, a certain quantity of water is forced into the 

 generator, at every stroke of the pump, and a correspond- 

 ing quantity forced from under the weighted valve 6, to be- 

 come steam. 



" These principles may be modified and applied to the 

 boilers of ordinary steam engines, a mode of adopting which 

 is shewn in Fig. 3. The invention is here represented un- 

 der another form, and diiFerently employed, being a plan 

 for heating the water of an ordinary engine-boiler, with a 

 view, principally, to save fuel ; 2;, is a tube communicating 

 with the ordinary steam-boiler ; a, a, is the generator, a cy- 

 lindrical metallic vessel, of which there may be several con- 

 nected together; these are filled with water as above des- 

 cribed, having the furnaces y, y, under ihem;^ b is the es- 

 cape-valve through which the heated water passes ; c, is 

 the weighted lever pressing down the valve with the requi- 

 red force : d, is the chamber and pipe, in which the heated 

 water that escapes through the valve becomes steam, and 

 thence passes through the tube z, into the boiler. This 

 boiler (of a cylindiical form with spherical ends) is propo- 

 sed to be inclosed within a cask or other vessel, and sur- 

 rounded with pounded charcoal, which material being a 

 very imperfect conductor of heat, is particularly well calcu- 

 lated to preserve the heat of the water and steam within the 

 boiler; e, is a pipe leading from the generator, which is al- 

 so filled with the heated water; and at the lower end of 

 this pipe there is an apparatus/, for ascertaining the pres- 

 sure of the fluid within the generator. This fluid., by exert- 

 ing its force at the lower end of the pipe e, against the lever 

 connected to a weighing-machine, causes the index to point 

 out upon the graduated dial-plate the number of atmos- 

 pheres under which the steam is generated. The pipe e, 

 being in substance considerably thinner than any other part 

 of the apparatus, is intended to give way, in the event of 

 the pressure within the generator being accidentally raised 

 to a dangerous height ; the consequence of which would 

 be, that the pipe e would open, and the steam blow out 

 through the fissure, without the possibility of producing 

 any injury ; g, is the pipe through which the water is in- 

 jected by the pump h, from the reservoir to the generator; 

 -/, represents the flue or chimney, from the furnaces below. 



