358 Dr. R. Hare on Improvements in the 



their bores communicate, by means of an appropriate brass 

 casting, with that oFthe large pipe, the joints secured by hard 

 solder. Their lower extremities are made to protrude about 

 half an inch from a box A, of cast brass, their junctures, with 

 the appropriate perforations severally made for them, being 

 secured by silver solder. They come out obliquely in a line 

 along one corner of the box, an interval of about a quarter of 

 an inch alternating with each orifice. By means of flanges, 

 the brass box is secured to a conical frustum of copper (fig. 2), 



so as to form the bottom thereof, while the pipe, extending 

 above the copper case, is screwed to a hollow cylinder of brass 

 Aj fig. 3, provided with two nozzles and gallows-screws g g, 

 for the attachment of appropriate hollow knobs, to which pipes 

 ^re soldered, proceeding from the reservoirs of oxygen and 

 hydrogen. Cocks are interposed by which to regulate the 

 emission of the gases in due proportion, 



In connecting the pipes conveying the gases with the brass 



