Prof, von Kohell upon Galvanography. 



245 



Fig. 7, the leaden disc which is laid on the plate of zinc ; the 

 strip proceeding from the disc is to be connected with the strip 

 proceeding from the base, fig. 4, by the application of the bind- 

 ing screw shown in fig. 8. 



Fig. 8. 



^- 



C^ 



Fig. 9, a glass rod bent so as tb form a triangle to be laid upon 

 the membrane forming the tamborine. It is on this triangle that 

 the zinc plate rests. For heavy zinc plates, a hooked support of 

 copper wire, as shown in fig. 10, is to be used. This wire sup- 

 port may be coated with wax. 



Fig. 9. 



Fig. 11, a pair of copper 

 or iron pincers for remo- 

 ving the plates from the 

 cupreous solution. 



Fig. 12 and figure 13, 

 show the apparatus when 

 the circuit is closed ; aa 

 is the base-plate, fig. 4 ; 

 hh the painted plate ; the 

 tamborine is shov/n above, 

 in which cc the glass tri- 

 angle, dd the zinc plate, 

 and e the leaden disc, are 

 seen above each other ; the 



Vol. xLvm, No. 2.— Jan.-March, 1845. 



Fig. 11. 



Fig. 12. 



32 



