560 SEC. 13. CHEMISTRY. 



2650. Drying Apparatus, with glass stopcock. 



Warmbrunn, Quilitz, S? Co., Berlin. 



2651. Exhaustion Apparatus, in glass, of two litres capa- 

 city. Warmbrunn, Quilitz, Sf Co., Berlin. 



2652. Bottle, for keeping mercury over acids. 



Warmbrunn, Quilitz, fy Co., Berlin. 



2653. Levigation Apparatus, with four tubes. 



Warmbrunn, Quilitz, Sy Co., Berlin. 



2654. Air-pump Receiver, with tubulures and glass stop- 

 cock, 280 mm. in height and 200 mm. in diam. 



Warmbrunn, Quilitz, $ Co., Berlin. 



2655. Aspirator, consisting of a double tubulated Woulf s 

 bottle and ground in glass stop-cock for the lower tube. 



Warmbrunn, Quilitz, $ Co., Berlin. 



2656. Glass Stop-cock, 330 mm. in length. 



Warmbrunn, Quilitz, fy Co., Berlin. 



2657. Vinegar Stop-cock, 190 mm. 



Warmbrunn, Quilitz, fy Co., Berlin. 



2658. Glass Bow, for mercury, provided with glass stop-cock. 



Warmbrunn, Quilitz, 8? Co., Berlin. 



2659. Finkener's Gas Evolution Apparatus, quite new. 



Warmbrunn, Quilitz, fy Co., Berlin. 



2660. Apparatus for the determination of Water, Car- 

 bonic Acid, &c., made by Dr. Geissler in Bonn. 



Dr. Drevermann, Hoerde, Westphalia. 



2661. A Collapsing Aspirator, of vulcanised rubber, for 

 rapid gas-analysis. Arranged to measure the gas to be examined 

 and to contain the absorbent. On agitation, the gas and absorbent 

 are brought into contact. Used by H.M. Inspectors of Alkali 

 Works. Alfred E. Fletcher, Liverpool. 



2663. " Water Jet " Pneumatic Pump, for laboratories, 

 &c. ; designed by Professors Arzberger and Zulkowsky, and con- 

 structed by P. Bohone, Engineer, Briinn. 



Professor Fred. Arzberger and Chas. Zulkowsky, of the 

 Polytechnic Institute, Briinn, Austria. 



The effect of this pump is based on the injection principle; it requires for 

 working it a water supply conveyed by high pressure, but no fall below ; 

 hence the difficulties are avoided which frequently impeded the employment 

 of earlier designed pneumatic water pumps. The rarefaction of air produced 

 by it, which is entirely dependent on the amount of pressure caused by the 

 influx of the water, may be increased with a single pressure of about one 

 atmosphere to a degree of tension equal to that of steam. 



Described in Liebig's Annalen der Chemie, Vol. 176. 



