86 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



Fig. 536. 



have on the top, stop-cocks, with a jet pipe uniting them, 

 having tubes and screws for attaching. There is also a 

 movable shelf for supporting bell-glasses, receivers, &c., 

 having a short funnel on the under side for conveying the 

 gas from the neck of a retort, or tube, into the bell-glass, 

 &c. The gas holders may be filled by setting on this shelf, 

 or by introducing a small tube beneath. They are made of 

 tin, japanned, and also of copper, usually twenty-two inches 

 long, twelve wide, and twelve deep, and also holding twice 

 these contents. 



Price, in japanned tin, $ 8.50; extra large, $12.00. 



" in copper, $12.00; " " $18.00. 



" stand for charcoal, - - - $ 1.50. 



Fig. 537. 



Gurney's Oxyliy- 

 drogen Blow-pipe. 

 (Fig. 537.) A com- 

 pact, powerful, and 

 perfectly safe, instru- 

 merit, for procuring a 

 constant and intense- 

 ly powerful flame, 

 applicable to the 

 usual purposes of a 

 blow-pipe ; that is, 

 the melting of small 

 quantities of refrac- 



