61. Potash bulbs : Liebig's,^>nc<3 2s. ; Geissler's,^Hce 

 Is. 3d. ; Geissler's, with drying tube, price 3s. Chloride 

 of calcium tube. Price lOd. Nitrogen bulb, Will and 



Varrentrapp's. Price 8d. 

 1876 and 



1886. Exhibited by J. Orme $ Co. 



62. Absorption tubes, five forms. Prices, Todd's, 

 Is. 3d. ; Babo's, 3s. ; Stromeyer's, 3s. ; Emmerling's, 4s. ; 

 WinMers, 5s. 



1886. Exhibited by Townson fy Mercer. 



Babo's and Emmerling's are filled with glass beads which are 

 wetted with the absorbing liquid ; the gas passing through the tube 

 is thus brought well in contact with the liquid. Stromeyer's is a 

 form chiefly used for absorbing carbonic acid by potash ; the gas 

 being caused to frequently bubble up through the potash, by 

 which means all the carbonic acid is removed and may be 

 weighed. Todd's is a form wherein the gas is exposed for a time 

 to a large surface of absorbing liquid without bubbling 

 through it. 



In Winkler's arrangement the gas enters the bottom of the 

 spiral tube containing the absorbing liquid and passes up the 

 spiral through the liquid. 



63. Filter pump tubes (4) of various shapes, in glass 

 (Finkener's, Geissler's, &c.). Prices Is. 6d. to 3s 



1886. Exhibited by Townson fy Mercer. 



Water passing through these tubes takes air along with it and 

 produces a diminished pressure in the filtering flask thereby 

 accelerating the filtration. 



64. Bunsen's filter pump. Price 11. 10s. 



1886. Exhibited by J. Orme $ Go. 



65. Hofmann's steam generator, for the lecture-room 

 table. 



E. 269. 1877. Made by E. A. Lent*, Berlin. 



The apparatus consists of two copper hemispheres bolted 

 together so as to be perfectly steam tight, fitted with a glass 

 water-gauge, a steam pressure gauge, a safety-valve and two 

 steam pipes, each fitted with a screw stopcock. 



66. Condensers (2), Allihn's and Liebig's. All glass 

 without any corks. The inner tube in Allihn's has 

 bulbs upon it ; otherwise it is like the Liebig's form. 

 Prices 3s. 6d. and 2s. 6d. 



1886. Exhibited by Townson fy Mercer. 



