JOINT APPLIED TO TUBES, &C. 107 



A is a hollow fphere * for containing alcohol, retting upon Description. 

 a (boulder in the ring O, Plate V. 



B is a bent tube with a jet at the end, to convey the alcohol 

 in the ftate of vapour into the flame at Q, this tube is conti- 

 nued in the infide up to C, which admits of A being filled . 

 nearly, without any alcohol running over. 



D is a fafety valve, the preffure of which is determined at 

 pleafure, by fere wing higher or lower on the pillar E, the two 

 milled nuts F and G carrying the fteel arm H, which reds on 

 the valve. 



I is an opening for putting in the alcohol. 



K is the lamp, which adjufts to different diftances from A, 

 by Aiding up or down the two pillars L. The diftance of the 

 flame Q from the jet, is regulated by the pipe which holds the 

 wick being a little removed from the centre of the bmfs piece 

 M, and of courfe revolving in a circle. 



N the mahogany Hand. 



IX. 



Defcription of a Joint applied to Tubes ufedfor conveying Steam 

 under confiderable Prejfure. W. N. 



JL HE valuable communication of my correfpondent N. N. Recollection of 

 in the laft number, has fixed my recollection upon feveral parts fome a PP aratus * 

 of my hydraulic and pneumatic apparatus, in which, though 

 they may be called bagatelles as far as relates to the magnitude 

 of the inventive powers required to make them, yet their utility 

 may be fuch as in many inftances to prevent lefs eligible con- 

 trivances from being adopted. 



In the firft place, I find among fome brafs work the inge- Early invention 



nious joint, Plate II. Fig. 2, lately contrived by himfelf, and of the J°j. ntfor 

 J ' ° J ' pneumatic appa- 



before him by Mr. Webfter, but in this cafe certainly maderatus. 

 many years ago by fome unknown mechanic. My piece, 

 which is for fpouting fluids, is prevented from being driven 

 afunder by a wire that pafles through its axis, and has a fmall 

 nut and vvather faced with leather. 



* If the bottom is made flat inftead of fpherical, the action of the 

 flame will then be greater. 



The 



