CHEMICAL LAMF. QQ'J 



meni have feeen fo much .improved during our own time, thai I^^f'^r'pt'on, &e. 

 by means of a comparalively fmall number of them, the moft chemicTnam^! 

 complicated proceffes may very commodioufly and conve- 

 niently be carried on in the ctolet of every culuvator of che- 

 miftry. 



To awaken the induflry of the junior clafs of chemifl";, I 

 gave in the twenty-fourth number of this Journal, a defcription 

 and tketch of a convenient and portable univerfal furnace, and 

 in the twenty-third number of the fame Journal, I ventured to 

 recommend to the younj^ analyft a cheap and ufeful apparatus 

 for drying the produfls of his analyfis, and alfo convenient for 

 experiments on artificial cold, jSfC. The favourable reception 

 which thefe trifles have met with amongfl: thofe amateurs of 

 the fcience for whom I have caufed them to be conflru<5ted, 

 {aas encouraged me to point out to them an improved lamp- 

 furnace, by means of which, in the fmall way and on the table 

 of the ftudent, almoit every operation may be performed at 

 a cheap rale, as well as with facility and dilpatch. In order 

 to enable the intelli^j^enl reader to judge for himft-lf, I Hjall 

 firft detail the conHruiJtion of the inllrument, and then point 

 out to the inexperienced operator fome of the mod capital pro- 

 celfes which (erve (o unfold the fundamental truths of the 

 fcience, and for which the lamp may be applied according to 

 the conditions laid down, 



fig. 1, Plate XIV. is a perfpe61ive view of the improved 

 chemical lamp-furnace. It conlift'^ of a brafs rod fcrewed to a 

 foot of the fan:ie metal, loaded with lead. On this rod (which 

 may be-unfcrewed in the middle, for rendering it more port- 

 able) flide three brafs fockets with Ihaight arms, terminating 

 in brafs rings of different diameters. The largeft meafures 

 four inches and a h*alt. Thefe rings fcrve for fupporting glafs 

 alembics, retorts, Florence- flaflcs, evaporating-balons, gas- 

 bottles. 8^-c. lor performing difiillations, digeftions, folutions, 

 evaporations, fahne fufions, concentrations, analyfes with the 

 pneumatic apparatus, ^c. If the veflels are not wiflied to be 

 fexpofed to the naked lire, a copper fand-bath may be inter- 

 pofed, which is to be previoufly placed m the ring. Each of 

 the brafs-rings may, by means of a thufub-fcrew acting on the 

 rod of the lamp, be fet at different height^ or turned afide, 

 according to the [ileafure of the operator. Below thefe rings 

 i§ a fountain-lamp on Argand's plan, having a metallic valve 



within. 



