106 



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



Fig. 576. 



Retort, with Cap and Stop- Cock. 

 (Fig. 576.) Retorts with brass cap and 

 stop-cock, by which the air may be ex- 

 tracted, and any gas introduced from a 

 bell glass. Price, $1.50. 



Fig - 577 ' Glass Blower's Table. 



(Fig. 577.) This consists 

 of a neat table with double 

 bellows worked by a trea- 

 dle, and having a pipe with 

 a jet urging a stream of air 

 through a powerful lamp, 

 supplied with tallow, and 

 is a very convenient article 

 for the use of those who 

 manufacture small articles 

 in glass, such as thermo- 

 meters, test tubes, orna- 

 mental objects, &c. The materials used are glass rods and 

 tubes, of different colors and sizes. The apparatus is merely 

 intended to produce a steady and intense heat, that the 

 glass tubes may be softened in a manner proper for the 

 artist to bend and blow them into the required form. 



A is a jet of metal, through which the air issues into the 

 flame of the lamp, B. The air is, by means of the treadle, 

 E, forced into the double bellows, D, and driven up the pipe, 

 c, until it issues from the jet. The whole is affixed to a 

 table. The bellows is loaded at the top in proportion to 

 the strength of the blast required. Price, $25.00. 



Apparatus for Chemical Analysis. For the greater num- 

 ber of analytical experiments on minerals, very simple appa- 

 ratus will be found sufficient. Tubes, flasks, and evaporating 

 basins, bottles, precipitating glasses, filters, funnels, dropping 

 tubes, a silver, a platinum, and porcelain crucible, each 

 capable of containing from a quarter to half an ounce, small 

 retorts and receivers, a balance, a pair of forceps, a mortar, 

 and a strong spirit lamp, constitute all that is necessary. A 

 blow-pipe and set of test-tubes are of great use. A sepa- 

 rate apparatus is also very desirable for the preparation of 

 sulphuretted hydrogen gas, which is much employed in 

 analytic operations. 



