638 SEC. 13. CHEMISTRY. 



adapted for all the purposes of a water air-pump, as it then corresponds to 

 the " Pulsirpumpe " designed by Faguo in Moscow, and described in the 

 report of the German Chemical Society, 5.328. 



2598. Blowing Apparatus for working a blow-pipe. 



C. Osterland, Freiberg, Saxony. 



This blowing apparatus has two wind-chambers, whereby a perfectly re- 

 gular stream of air may be obtained, even without any previous practice. It 

 has a movable jet, constructed by the exhibitor, Avith an air-tight ball-and- 

 socket movement. It may be screwed fast to a table, and will continue 

 blowing for nearly a minute before the air-chambers get exhausted. It can 

 also be worked by the foot, so as to leave both hands free. The stream of 

 air can be regulated by a tap, in order to suit every requirement. 



2570. Hofmann's Table Blowpipe Lamp. 



Julius Schober, Berlin. 



2571. Buns en's Table Blowpipe Lamp. 



Julius Schober, Her tin. 



257 la. Apparatus for developing the new system of Blow- 

 pipe Chemistry, called " pyrology," a " spectrum lorgnette," 

 pyrological candles, and other novelties ; together with some, of 

 the results, as the sublimate of gold on aluminium plate, &c. 



Major W. A. Ross. 



2561. Small Copper Steam Generator. 



Julius Schober, Berlin. 



2596. High-pressure Steam-boiler, together with a dis- 

 tilling and condensing apparatus, as well rs a drying closet, 

 capable of being heated by steam. E. A. Lentz, Berlin. 



The apparatus is heated by 10 Bunsen burners ; when steam is once got 

 up only half the number is required to keep it up ; the other half may then be 

 turned off. 



The three openings in the apparatus for evaporations are separated from 

 the steam chamber by copper casings, and the steam is let into the latter when 

 required for use by means of small valves. It is thus possible to maintain a 

 certain pressure of steam in the boiler, which is of especial importance when 

 steam has to be used for distillations and for conducting to a distance, as, for 

 instance, in the heating of distant drying-closets. 



2596a. Apparatus for Drying in Vacuo. 



Prof. Marhovnihoff, Professor of Chemistry at the Uni- 

 versity of Moscow. 



2596b. Laboratory Furnace; magnesia. 



Prof. Schloesing, Conservatoire des Arts et Metiers, Paris. 



2596c. Laboratory Furnace ; brick. 



Prof. Schloesing, Conservatoire des Arts et Metiers, Paris. 



2596d. Distilling Apparatus, for laboratory. 



Prof. Schloesing, Conservatoire des Arts et Metiers, Paris, 



