^4f ^PORTABLE STEAM ETfGIXE. 



Dcfcription of vaK'c for adjufting the quantity of fleam (that a6ls againft the 

 ciSne!'^^ ^^""^ pifton) in its padige through the valve box. There are alio 

 three other openings in tjje bottom of this valve box, one of 

 which conne6ls wilh the top of the cyhncier by tlie pipe in the 

 intermediate fpace, the fecond with the bottom, and the third 

 with lheedu6^ion pipe that leads to the condenfor. Two of 

 thcfe openings are alternately connected together by a Aide 

 valve,* while the third is left open for the admiffion of fteam 

 to the pi>fton, this valve changes its pofuion at the end of each 

 'Ihoke of the pifton, and performs all the purpofes of the moli 

 complicated machine. 



H The air-pump conne^ed with a condenfer at the bottom 

 of the eduction pipe. 



I. The fly wheel fixed upon an axis which receives its 

 .motion from a crank conneOed with the beam by the rod K. 



LL Two rods for connecting the motion of the pifton to 

 the beam, thefe rods move perpendicularly by a motion which 

 could not be conveniently fnewn in this view without render- 

 ing it confuied. 



M A fpherical trrangl^ turn'd by the crank for moving the 

 flide valve by the horizontal rod N that conneds them toge- 

 ther. This motion has the advantage of preventing the engine 

 from ever turning the contrary way round from that which it 

 I is wanted to go, and prevents the noife that is ufually heard in 



engines, 



O The beam attached to the bottom of the ciHern C by 

 means of the hanging carriages V. 



Q A reft or fixture in a wall for the end of the fly wheel 

 (haft; this will vary according to the fituation where the en- 

 gine is to be fixed, or it may be fupported by a metal flandard. 



R. Index to the injedion cock that admits water to the 

 condenfer. NoiCi The cifiern is to be kept nearly full of water 

 'during the time the engine is at work. 



The cylinder G and valve box E muft be furroonded on all 

 fides by a cafe (not fhewn in this view) the fpace between 

 filled with charcoal to prevent the tranfmiffion of heat, which 

 4f eifeflually done will work with the lead poffible quantity of 

 coals, as it combines' the advantages of every other engine 

 hitherto known. By detaching the air-pump and condenfer 



* i^oi- thefe valves 1 tqok OAit a patent in 1S02, 



(whick 



