SCIOPTICON MANUAL. 



hydrogen stop-cock by a piece of rubber tubing, H. 

 The tubing, in connection with the oxygen stop-cock, 

 extends downward towards its connection with the oxy- 

 gen bag, or cylinder, which is not here shown. 



The alcohol passes through a side aperture, A, up the 

 nozzle n (Fig. 37), to its level in the cylindrical wick- 

 tube a, filling it about two-thirds full, and saturating 

 the wick w, which loosely fills the space 

 between the concentric tubes. 



If on lighting the wick (which is 

 done by reaching it in the lantern with 

 a lighted match) it burns feebly, for want 

 of being fully saturated, we may give 

 the flexible alcohol tubing, H (Fig. 36), 

 a sliding pressure towards the jet, being 

 careful not to overflow the wick tube. 

 The alcohol should be of the best 

 quality, and high enough in the foun- 

 tain to feed a vigorous flame. 



The atmosphere, while supplying 

 oxygen to the outside of the flame, 

 compresses the inner hydrogen vapor Q . 

 into combination with the jet of oxygen 

 as it strikes upon the lime above. 



When the exhibition is over, we may *' *' Fig ' 37 ' 

 let the fountain hang down by its tubing till the alcohol 

 drains back into it, before closing the stop-cock. 







TIIK HOUSE GAS BUKXER. 



In towns and wherever illuminating gas is in supply, 

 it may be led by flexible tubing from the bracket to 

 the blow-pipe, and so through the same side aperture, /*, 

 in the nozzle into the conical tube g (Fig. 38), burning 

 above the oxygen jet o like the alcohol flame in No. 1. 



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