SS@ Experiments on the Fiifion 



C — The same, in every respect, only C is filled with hi- 

 drogen, by hydrostatic bellows at 00, or by a recurved tube, 

 as above. 



D. — Copper Tubes, half an inch in diameter, furnished 

 with stop cocks at^, and inserted into the gas reservoirs B. C 



E. — Recurved tubes of flexible metal, furnished with dou- 

 ble screws at F, which connect them with a pair of brass blow 

 pipes, cut off at G, and soldered to two strong cast silver 

 tubes, which screw, air tight^ into H, an inverted pyramidal 

 piece of platinum, in which, two converging ducts as large as 

 a pin are perforated, forming a continuation of the tubes, and 

 uniting in a common passage, somewhat larger, just before 

 their exit, at the common orifice belov*^. The subject to be 

 operated upon is sustained by charcoal, or forceps, and held 

 by the hand, just below the orifice in the piece H. 



The gasses at B. C are under hvdrostatic pressure, which 

 is easily recruited, as the gasses run out, either by throwing 

 common air with the bellows, into one of the spare reservoirs, 

 or, by introducing more of either of the gasses into the appro- 

 priate reservoir, and, peculiarly of hidrogen, both, on ac- 

 count of the facility with which it is obtained, and because, 

 twice as much of it, in bulk, is wanted, as of oxigen. 



The rapidity of efflux of the gasses, and their due propor- 

 tiofi, is easily regulated, by turning, more or less, the keys of 

 the stop cocks atyi and the effects of either gas alone, may 

 be observed, by shutting the stop cock leading to the other. 



When the compoimd flame is des'red, the hidrogen is first 

 let out, and fired ; the blaze should be somewhat larger than 

 that of a candle ; the oxigen is then let into the hidrogen till 

 the cflPect is the greatest, Avhich a little habit v/ill soon asceiv 

 tain. 



The flame of the hidrogen is very much narrowed, by the 

 introduction of oxigen, and there is no appearance of peculiar 

 splendor or heat, till some body, capable of reflecting the 

 light and heat, is placed in the focus, which is usually about 

 one fourth of an inch below the orifice. 



All the apparatus below F F is easily detached, by turning 

 the double screws ; — the strong silver tubes are intended tp 

 prevent fusion of this part of the apparatus, and to admit of 

 connexion with the platinum piece by means of a screw cut on 

 the silver tubes ; this obviates the necessity of using a solder, 

 which would be very liable to melt, and, the platinum piece 

 is, for a similar reason, substituted for the silver cylinder ori- 

 ginally used by Mr. Hare, as experience has shewn that these 

 are liable to fusion. 



No flux or addition of any kind was employed in the fol^ 

 lowing experiments. 



