Serial N
o, 386,660.
NIKOLA TESLA, NEW YORK, Y.United States Patent Office.
SPECIFICATION forming part Letters Patent No.
The strength this leakage current pro
portional the difference potential, and,
5° therefore, proportion the strength the
current passing through the conductors. These con
ductors may corrugated formed other 85
proper ways offer the desired electrical re
sistance. resistance connected se
ries with the two conductors C', which by
their free terminals are connected the
circuit one the conductors 90
The method using this device and com
puting means thereof the energy the
current will readily understood. Then kuown current passed
through the instrument for given time, and
by second measurement the increase and
diminution the resistances the two con
ductors respectively taken.)
To whom concern:
Be known that Nikola Tesla, sub
ject the Emperor Austria, from Smiljan,
Lika, border countryofAustria-Hungary, and
5 residentofNewYork, the county and State
of New York, have invented certain new and
useful Improvements Electrical Meters, of
w’
nicli the following specification, refer
ence being had the drawings accompany-
io ing and forming part the same.
ELECTRICAL METER. First,
the resistances the two conductors O',
respectively, are accurately measured and 93
noted.
From such variation the resistance either
or both the conductorsformingthe positive 65
and negative electrodes the cellthe current
energy expended may readily computed. 455,068, dated June 30,1891.
iS The principle the invention embodied,
in any form apparatus which con
ductor immersed electrolytic solution is
so arranged that metal may deposited upon
it taken away from such manner that
2o its electrical resistance varied definite
proportion the strength the current the
energy which computed, whereby
such variation resistance may serve a
measure the energy may utilized in
25 various well-understood waysto bring into ac
tion suitable automatic registering mechan
ism when the resistance exceeds falls below
predetermined limits.
In Fig.
Moreover, there constant difference of
potential between the tsvoconductors through
out the entire extent that exposed the
solution, the current density through such so- 55
lution the same all corresponding points,
and hence the deposit uniform along the
whole one the conductors, while the
metal taken away uniformly from the other.
ApplicationfiledM
arch27,1891.
My invention pertains methods and
apparatus for estimating the electrical energy
that has been expended electric circuit
or any given portion the same. G
- designates suitable direct- 73
current generator.
Other modified arrangements the con
ductors are contemplated, will under
stood from the following description and ref- 70
erence the drawings. are the conductors
of the circuit extending therefrom and in
cluding and supplying lamps other trans
lating devices tube, preferably of
glass, the ends which are sealed, 80
means insulating plugs caps CC'
are two conductors extending through the
tube their euds passing out through the
plugs terminals thereon. From these data too
the constant obtained—-that sa3r, for
example, the increase resistance one
conductor the diminution the resistance
of the other per lamp-hour.
In carrying out invention prefer to
30 employ electrolytic cell, through which ex
tend two conductors parallel and close
proximity each other.
The figures are diagrams showing the me
ter operative relations working-circuit
and under slightly-modified arrangements. These two meas-
. The free ends terminals of
the conductors are connected either series
in the circuit supplying the current the
lamps other devices parallel re-
40 sistance the said circuit and series with
the translating devices. Under such circum
stances current passing through the con
ductors establishes difference potential
between them which proportional the
45 strength the current, consequence of
which there leakage current from one
conductor the other across the solution. connect these con
ductors series through resistance, but in
such manner that there equal difference
35 potential between them throughout their
entire extent.
The- resistance one conductor this 60
means diminished, while that the other is
increased both proportion the strength
ofthe current passing through the conductors. (N
om
odel
