DESCRIPTION OF PLATE 5. 
A. Suspended zinc plate attached to balance arm. Connected to earth by 
a flexible spiral of No. 40 wire, B.W.G. 
B. Guard-ring of zinc with parallel faces. 
C, C. Zinc legs attached to B by brass screws. 
D, D. Brass levelling screws with lock-nuts, for levelling guard-ring. 
E. Glass plate covered with a sheet of tin-foil F, which forms the high 
potential armature of the condenser. 
F. Tin-foil surface attached to flat glass plate E. 
G. Cake of sulphur. 
H. Connection from F to the induction coil. 
I. Metallic connection from legs of guard-ring to outer tin-foil case and 
earth. 
J, J. Ebonite pillars supporting glass plate. 
K. Wooden base supporting J, J, and E. 
L, L. Levelling screws by which the tin-foil surface may be brought level and 
parallel to A. 
M, M. Glass and paraffin insulating stands supporting the three levelling 
screws, L, L, L. 
N. Millboard box coated inside and out with tin-foil, and protecting the 
back of the suspended disc from induction. 
P. Large millboard box coated with tin-foil, and surrounding all the 
apparatus. It is put to earth, as is N. 
Q. Metallic casing surrounding the balance. 
S. Condenser in parallel with secondary terminals to swamp the capacity 
of the sulphur condenser. 
T. High potential Kelvin voltmeter. 
X. High potential terminal of secondary. 
Y. Low potential terminal of secondary, put to earth on water main. The 
same earth connection is made throughout. 
