170 A. W. Wright— Electrical Deposition of Metals. 
was found necessary to-construct a special apparatus, in which 
the relative positions of the plate and the electrode could be 
varied, so as to give the latter an equal action upon all parts 
of the surface to be covered. The plan employed was as 
described in the following paragraphs. — 
rather thick-walled glass globe about seven centimeters in 
diameter, blown upon the end of a tube twenty-five centime- 
ters long and fifteen millimeters in diameter, was used to form 
the receiver. The top of the globe opposite the tube was cut 
off, so as to form an opening forty millimeters in diameter, and 
the edge ground flat, in a plane perpendicular to the axis of the 
tube. The end of the latter was drawn somewhat smaller in a 
gas-flame, and a glass stop-cock attached to it with cement. A 
little way above this, a platinum wire was fused into the glass 
to serve as the positive electrode. The cover of the vessel was 
made by cutting from a similar globe a portion corresponding 
in size to the part removed, but with the neck attached, the 
two pieces being carefully ground so as to fit closely. When 
they were placed together, a little cement applied to the out- 
side along the line of juncture rendered the joint perfectly air- 
tight. The tube or neck of the cover was five centimeters 
long, and was also somewhat reduced at the extremity by 
drawing it smaller. Into this was cemented a small and thick- 
walled tube extending to a point near the center of the globe. 
A platinum wire was placed in this tube, and was fused in at 
the top, enough being left projecting to form a small loop for 
the attachment of the wire from the coil. The inner end of 
the wire terminated at about one centimeter from the lower end 
of the glass tube. Into the latter was slipped a wire of the 
, was the negative 
g long enough to 
The pan, when in 
meters below the end of the tube 
