556 SEC. 13. CHEMISTRY. 



This apparatus may be used for scientific as well as technical determina- 

 tions of the carbonic acid contained in chalk, bone charcoal, &c., and is 

 extensively used in the sugar refineries of Germany and Russia. 



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 moveable jet, constructed by the exhibitor, with 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. 



2599. Copper Water Bath, nickel-plated, together with a 

 tripod stand and rings of porcelain as well as metal, and provided 

 with an arrangement for keeping the water at a constant level. 



Warmbrunn, Quilitz, Sf Co., Berlin. 



2600. Copper Water Bath, together with a tripod stand, and 

 an arrangement for keeping the water at a constant level, a set of 

 copper rings, and also a cover with different sized openings. 



Warmbrunn, Quilitz, 8? Co., Berlin. 



2601. CarmichaePs Suction Funnel, with improvements. 

 Chemical Laboratory of the University of Gdttingen (Pro- 

 fessor Hubner). 



2602. A. Mitscherlich's Apparatus for the continuous 

 evolution of chlorine gas, together with a water bath having a 

 constant water level. Professor A. Mitscherlich, Miinden. 



This apparatus is described in A. Mitcherlich's chemical publications, part 2, 

 p. 6. 



2603. E. Mitscherlich's Vapour Density Apparatus. 



Professor A. Mitscherlich, Miinden. 



This apparatus is described in E. Mitscherlich's text book of chemistry, 

 p. 308, and was employed by him in determining the specific gravity of 

 vapours. 



2604. Large Glass Gas Holder, described by K. Miincke 

 in Dingler's Polyt. Journ., vol. 218, p. 40. 



Warmbrunn, Quilitz, fy Co., Berlin. 



2605. Large Copper Gas Holder, of bright metal. 



Warmbrunn, Quilitz, fy Co., Berlin. 



2606. Large Copper Gas Holder, bronzed, with top water- 

 reservoir. Warmbrunn, Quilitz, Sf Co., Berlin. 



2607. Miincke's Copper Water Oven, two-walled, with a 

 Warmbrunn-Quilitz thermostat, a thermometer and side-tube, 

 showing level of water. Warmbrunn, Quilitz, fy Co., Berlin. 



This apparatus is described in Dingler's Polyt. Journ., vol. 219, p. 72. 



