300 Dr. J. Hopkinson on the 
A closer approximation to observation is obtained byassuming 
the two contact-posts to be of slightly different capacities; the 
difference given above is no more than might be expected to 
exist. 
The jar being charged to standard potential, B was insu- 
lated, and its post raised,and A was connected to 10 Daniells, 
for which 0=1808 :— 
Deflection observed = 293°2, 
5» calculated = 293-0. 
The post of B was lowered to contact :— 
Deflection observed =467:0, 
» calculated =466°8. 
A was now insulated and post raised, B was connected to 
the same battery:— 
Deflection observed = 251:0, 
5 calculated =251;6, 
The post of A was lowered to contact :— 
Deflection observed = 429-0, 
5 calculated =428°8. 
The jar was now charged to a lower potential, for which 
//= py with B insulated and post raised, and A connected to 
30 Daniells, for which 0=5468 :— 
Deflection observed =925:°0, 
»  calculated=924-0. 
The post of B was lowered to contact, and A connected to 
10 Daniells, for which 6=1808 :— 
Deflection observed =470°5, 
» calculated =470°85. 
A was now insulated and post raised, B was connected to ~ 
a battery of 30 Daniells, for which 6=5468 :— 
Deflection observed =798:0, 
5 calculated = 800-0. 
The post of A was lowered to contact, and B was connected 
to 10 Daniells ; @=1808 :— 
Deflection observed =437°0, 
», calculated =435°7. 
The jar was then charged to a still lower potential, for 
which #=/4, with B insulated and post raised, and A con- 
nected to 30 Daniells, for which 02=5468 :— 
Deflection observed =901°0, 
» calculated =903°6. 
The post of B was lowered to contact and A connected to 
