FOR CONVEYING STEAM. 109 



them when applied together. Laftly, there is a difli fpring o 

 between p and g. When g (which Hides loofely upon the 

 pipe i) h fere wed upon f, it preifes p by the intervention of 

 tiie (tiff dim fpring againft the interior of/, and makesafecure 

 junction j but the pipe 2, reprefented in Fig. 1 as pendant, or 

 in a vertical pofition, may be moved round in the fame plane 

 to any elevation or depreflion whatever. 



The cap d being fere wed on the body of the cock at t, con- 

 ftitutes a joint of the fame kind, by means of which the pipe i 

 may be moved into any horizontal pofition : Confequently, by 

 thefe two motions, that pipe may be placed in every poffible 

 fituation. 



If we fuppofe the pipe i that proceeds immediately from the 

 cock, to be of confiderable length, as for convenience it is 

 required to be, its poffible changes of pofition will not be fuf- 

 ficient to adapt it to the ufual operative purpofes. It may there- 

 fore, in feveral cafes, be convenient to apply two other limilar 

 joints k and / at right angles with each other, by means of 

 which it will be immediately feen, that the exterior pipe w 

 may be placed in any required direction, not merely with re- 

 gard to a point immediately above the boiler, but with regard 

 to another moveable point at an equal diftance from the fire. 



I fliall conclude this paper by obferving, that the bended The dift htkm 

 wailier or difh fpring is ufed in the vice and fome other mecha- S ener aUy recom* 

 nical tools, but that it far from being as much ufed as it ought 

 to be. For there js fcarcely any action of pinching, preffing, 

 or binding, in which it would not be advantageous, and 

 would, in many cafes, prevent ferious mifehief and inconve* 

 niences. 



X. Memoir 



