BAIRD &TATLOCK (LONDON) LTD. 



SECTION No. 21. 



Hoffman's Apparatus for Volumetric Analysis. 



(See his " Introduction to Modern Chemistry," or Roscoe and Schorlemmer's 



" Inorganic Chemistry.") 



u 



5909-5911 5912-5914 5918-5923 



Apparatus to show that three volumes of hydrogen and one volume of nitrogen form two 

 volumes of ammonia gas. Consists of a U tube, with two stopcocks and platinum elec- 

 trodes, one limb of U tube graduated 50 cubic centimetres. After filling the tube with 

 mercury, two volumes of ammonia gas are introduced into the closed limb and decomposed 

 by sparks from an induction coil. The volume of gas gradually increases, and finally 

 produces three volumes of hydrogen and one of nitrogen . . . . . . . . 096 



Apparatus, as above, with metal stand . . . . . . . . . . ..0186 



Apparatus, as above, with wooden stand . . . . . . . . . . 14 



Hoffmann's Apparatus, with one stopcock and closed limb, with platinum electrode, 



graduated into 50 cubic centimetres . . . . . . . . ..086 



Hoffmann's Apparatus, as above, with metal stand . . . . . . . . 17 6 



Hoffmann's Apparatus, as above, with wooden stand . . . . . . . . 0130 



Hoffmann's Apparatus, as No. 5912, but with closed limb ungraduated . . . . 060 



Hoffmann's Apparatus, as above, with metal stand . . . . . . . . 0150 



Hoffmann's Apparatus, as above, with wooden stand . . . . . . . . 10 6 



Hoffmann's Apparatus for the decomposition of water. Consists of two tubes with 

 stopcocks and platinum electrodes, and a tube with bulb reservoir, all being connected 

 at bottom. Two or more Bunsen's or Grove's Cells are required for the decomposition. 

 The gases are collected separately in the tubes and tested at the stopcocks . . . . 12 C 



Hoffmann's Apparatus, as above, with metal stand and double terminals . . . . 140 



Hoffmann's Apparatus, as above, with wooden stand ,, . . 18 6 



CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



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