APPENDIX. 221 



*' In figure 2, A, B, C, D, reprefent a vertical fe£lIon 

 " of a copper box, twenty-feven inches long, feven inches 

 " wide, and eleven in height, tinned on the infide. In 

 ** the bottom F, is an aperture about fix inches in diameter, 

 " having a ring to fit on the ftill or boiler. The dotted 

 " lines which run nearly horizontal, are vefTels of thin 

 " copper, tinned on the outfide, two feet long, feven 

 " inches wide, and three quarters of an inch deep. At 

 " G is a funnel to receive cold water, which is conveyed 

 *' into the vefTels by communicating pipes, contrived in 

 ** fuch a manner as to form a complete and quick circu- 

 *' lation of the water through their whole extent. When 

 ** the water is become hot by the adion of the fleam, it 

 " is difcharged by the horizontal pipe at A. E is a pipe 

 ** from which the diftilled water or fpirits run, and is bent 

 ♦< in fuch a form, that the liquor, running from it, afts 

 ♦< as a valve, and hinders any fleam from efcaping that 

 " way. On the top of the box, at H, is a fafety-valve, 

 *' which prevents any danger from a great accumulation 

 *' of vapour, not condenfed for want of a proper fupply 

 " of cold water." 



Account 



