Large currents.
Only
small currents
can
be measured
directly
(without
current
branching)
with the apparatus described
because
one
cannot choose
a
value of
tg (2u) exceeding
1/4.
For that
purpose we use
eccentric
current
circuits.
[Fig.]
By
a
calculation analogous
to that
above,
one
obtains
Torque
=
Mi
cos u
JR2
+
a2
The
counterac[ting]
torque is again
M.H
sin
u
R2
UR2
+
a2
)3
Ii
=
H
H
tg (2u).
Considerable current strengths
can
be measured in this
way,
especially
if
one
has two movable circuits.
One has t[hen]
Torque
I

Torque
II
=
HM
sin
u
.
One
gets
H
1
i
=
TETT
1
1
tg
u
•
T\ 3
(VR2 +
a2)3
(R2
+
a2)3
Large
currents
can
be measured directly in this
manner.
[Fig.]
122