QO^ ON EVAPORATING FUKVACES. 



afterwards detonated by flight fridion. Next day, that is to 

 fay twenty-four hours after the preparation, this young perfon 

 was defirous of taking an equal quantity from the capfiiie to re- 

 peat the experiment, but he had fcarcely touched the preparation 

 with the corner of a card when a violent detonation andexplo- 

 fion took place in the capfule which was (battered into a thou- 

 fand pieces. His face was covered with the vaporifed prepa- 

 ration, which was almoft black, and adhered ftrongly to the flvin r 

 his eyes experienced a ftrong fliock, which produced extreme 

 pain ; the opaque cornea became red and inflamed. Happily 

 his fear was the greateft evil : by walhing and bathing his eyes 

 and face frequently with cold water, the efTeifls of the detona- 

 tion were foon diffipated. 



Fortunately, none of the fragments of the glafs had touched 

 his eyes or his face ; they were thrown nearly in a horizontal di- 

 redion, to a confiderable diftance: Some were thrown upwards 

 of twelve feet. 

 \ As the effedls of this preparation may have more calamitous 



confequences. I think it ufeful to be guarded againft the dan-, 

 gers which it may occafion. 



XIV. 



Pyrotechnic ObferrationSt with their application to evaporating 

 Furnaces *, By Cit. C u r a u d a u , Carre/ponding Member of 

 the Apothecaries Society of Paris, and Refident Jjfociate at the 

 Atheneum of Arts, 



&INCE I publiiTied ray obfervations on the caufes of the 



imperfections of evaporating furnaces, I have had occafion to 



make others on the fame fubje6^, the application of which may 



add to the advantages in their conftrudion which I have made 



known. 



Plfadvantagcs in I" ^y ^^^ memoir, I proved that the bottom of the copper 



the conftruftion in the evaporating furnaces, not only obftru6ls the elevation of 



furnlces'^&c! ^^® temperature, but alfo diminithes the adivity of the fire, and 



is rather favourable to the gazification of the combuflible body, 



than to its oxigenation : I cited the lamp of Argand with its 



* From Annales dc Chimin, No. 149, Floreal, An. XII. 



glafs 



