430 J. P. Cooke— New Mod< »f Ma,,i v »h,tin<i Hydric Sulphide. 



fountains ; and i 

 by j 



we use three, connected in a line by similar lengths of rubber 

 hose, like so many Woolf s bottles. In the figure, only the 

 first of the line is represented, which is set on trunnions in a 

 frame, in order to facilitate tin' agitation of the water and the 

 gas. Only one of these frames, however, is required, to which 

 the other fountains can readily be transferred. A section of 

 the generator is represented in Fig. 2. It is made of oast iron. 



and in two parts (readily distinguished in the figure), which are 

 firmly bolted together, so as to confine in its place the bell- 

 metal plate M, which separates the upper from the lower cham- 

 ber. In the lower chamber is placed dilute sulphuric acid, 

 which is poured in through the bung A. In the upper cham- 

 ber, and resting on the plate, is placed coarsely powdered 

 sulphide of iron, which is put in through the bung B. Through 

 the plate M, and on two lines at right angles to each other, 

 there are cut radial slits, half an inch wide, which are guarded 

 by four iron arms. These arms are attached to th< 

 shaft S, and move over the surface of the plate, alternately 



