(2) Fully discharge C, and with the galvanometer shunted
by S, close K to a, so as to charge

the condenser C to a potential z'j, / I'l'l'l' x

and note the first throw Dj on G. / y (orr^^- ,

(3) Allow C to sta;iJ insulated for f^ j\r\hJ^r-N^i--!\N\M\N\t\r\N\h^ B

t sees., and disconnect S by releasing "' ''' '^\ ^

the high-insulation key in its circuit. Vi ic \y^

(4) Close K to « again, and /- ' \X../^g\— ^
note the first throw D, on the un- Vjiy / Na'.^
shunted galvanometer. "-i s

(5) Repeat (2)-(4) for three or y\g. 25.
four different values of S, /'i, and r.,.
The value of C and the increased multiplying of the shunt S
can be obtained as follows ; —

B. (i) Insert the condenser of known capacity, Ci (microfarads)
in the place of C, and adjust the galvanometer to zero if necessary.
(2) Close K to (7, so as to charge C, with the same potential t\
and the galvanometer unshunted, and note the throw d^ divisions
on the galvanometer.
so



Practical Electrical Testing.
(3) Discharge Cj completely, and shunt G with the same
shunt as was used in Obs. A (2). Now close K to /', so as to
charge Ci with an increased potential z'„, and note the first throw
d„ on the galvanometer.
(4) Tabulate your results as follows : — '



Capacity of well-insulated condenser, Ci, =


mfds. ; galvanometer resistance, g^


= ohms.
B.
A.
fn).
('2)-


dl.
d-i.
Shunt,
S.
Multiplying power

of shunt,
J, _S + f +^'
■f ~ s

_ 1'2 di
~ f 1 ' "2


D,.
D2.
Time

in
sees.,

t.
Capacity of

leaky condenser,
C mfds.
