56 Dr. M. Baumert on a new Oxide of Hydrogen 



by fusion ; the latter serves for the reception of the apparatus h 

 (fig. 1), the office of which is to collect the products of the decom- 

 position of the ozone. This apparatus also consists of two parts 

 united by a glass tube closed with two corks. The first globe 

 apparatus contains a concentrated solution of iodide of potassium; 

 the other, bent backwards, is filled with concentrated sulphuric 

 acid, for the purpose of retaining the water carried along by the 

 oxygen : at one end it is ground into the short tube of the cap. 

 Before the commencement of the operation, the union between it 

 and the glass cap, as well as that between the latter and the drying 

 tube, must be rendered air-tight ; for this purpose the parts are 

 enveloped in a piece of platinum foil an inch broad, and this is 

 covered with a thick layer of shell-lac reaching up to the glass. 

 At the opposite end of the globe apparatus, from which the 

 oxygen, after passing through the sulphuric acid, is again ex- 

 pelled, an india-rubber tube, dried by a stream of dry air, and 

 united with a chloride of calcium tube, is attached ; this is omitted 

 in the figure. Lastly, the globe apparatus is protected from 

 dust during the whole course of the operation by means of a 

 cloth. 



The fluid employed for the electrolysis is placed in a cylinder, 

 k (fig. 1) ; the height of this column of fluid is proportioned to 

 the pressure to be overcome in the various parts of the apparatus. 



This arrangement of the whole apparatus presents great advan- 

 tages as regards the putting of it together. When the drying tube 

 with its attached tube is firmly placed, the tube, fig. 2, is passed up 

 into the latter (fig. 3) from below. To prevent it from sinking, the 

 wire of the positive pole may be held tight with a caoutchouc ring, / 

 (fig.l). The porous cell is then attached, and the cylinder is also 

 passed up from below; this is placed in a refrigerator, m (fig. 1). 

 The cylinder is then filled, and finally the negative pole n (fig. 1) 

 sunk into the fluid. When the evolution of gas has proceeded 

 far enough for the removal of any moisture, the weighed globe 

 apparatus, containing the solution of iodide of potassium, is 

 attached to the cap in the manner already described. 



As may be seen from the figure, only the gas produced at the 

 positive pole passes through the apparatus. In order to obtain 

 only tolerably ponderable quantities of ozone, disproportionately 

 large volumes of gas must pass through the apparatus. It was 

 consequently of great importance to ascertain whether the drying 

 tubes before and behind the iodide of potassium were sufficient 

 to retain every trace of moisture from the gases passing through 

 them. For this purpose 150 litres of electrolytic gas, from 

 which the ozone had been removed, were passed through the 

 apparatus. The globe apparatus containing the iodide of potas- 

 sium gained only 00004 grm. in weight during this process. 



