the rays acting upon
the cell sensitive device are varied in-
xo termitted any arbitrary manner, when
transmitting intelligence the usual way
from distant station means short and
long signals, the apparatus may readiiy be
made record enable operator to
IS read the message, since the receiver—suppos
ing ordinary magnetic relay, for
example—will operated byeach signal from
the sending-station certain number times,
having some relation the duration each
2o signal. It
magnifies large degree the current sup- 80
plied from the battery, and owing these
features permits energy stored and
discharged practically any rate desired,
and thereby makes possible obtain the
receiving-circuit very great changes the 85
current strength impressing upon the bat
tery-current very small variations. 3,
35 which the devices already described are
indicated similar letters correspond with
those Fig. Again, the
several instruments may connected the
manner Wheatstone bridge, will be
hereinafter explained with reference Fig. will readily seen, however, that
if the rays are varied any other way, as
by impressing upon them changesin intensity,
the succeeding condenser discharges will un
dergo corresponding changes intensify,
25 which may indicated recorded suit
able receiver and distinguished irrespectively
of duration. assumed in
the present instance that the disturbances 130
be investigated utilized are such will
produce difference electric potential, how
ever small, between two points regions in
the natural media, the earth, the water,
. this case will ob
served that the condenser, which being
charged from the battery through the re-
40 sistance preferably inductive and properly
related the capacity the condenser, will
store less energy when the sensitive device
a energized the rays, and its resistance
thereby diminished. may useful
to state that the electrical connections of
30 the various devices illustrated may made
in many different ways.
With reference Fig. The adjustment the
45 various instruments may then such that
the receiver will operated only when the
rays are diminished intensity interrupt
ed and entirely prevented from falling upon
the sensitive cell, the sensitive device may
50 be'pliiced, shown Fig. Other
means storage possessing these character
istics useful degree may employed
without departing from the broad spirit 90
my invention; but preferto use. find preferable, 70
however, follow the plan which have illus
trated and described.
The scheme connections the main that
of Wheatstone bridge, the four branches 110
which are formed the sensitive device a
and resistances I/, and L", all which
should preferably inductive and also ad
justable continuous manner, least
by very small steps. sothat the
figures become self-explanatory.- modified arrangement appa
ratus illustrated which particularly 95
adapted for the investigation and utilization
of very feeble impulses disturbances, such
as may used conveying signals pro
ducing other desired effects very great dis
tances. 5—in both of
which figures the various devices are lettered
55 correspond with those Fig.
60 otherwise connected related; but in
each case the sensitive device will have the
same duty perform—that is, control the
energy stored and utilized some suitable
way for causing the operation the receiver
65 correspondence with the intermittances or
variations the effects disturbances—and
in each instance judicious selection of
the devices and careful adjustment the ad
vantages method may more less
completely secured. The four resistances included in
the branches the bridge—namely, L',
and L"—are suitable size and propor
tioned that under normal conditions:
—that is,
when the device not influenced all 125
only slightly the disturbances—there will
be difference potential, or, any case,
the minimum the same the terminals T
and the condenser. shunt the
resistance inserted any suitable way
in the circuit containing the receiver—for
example, illustrated Fig.
In Fig. I
have shown that reason its unique prop- 75
erties greatly adds the efficacy this
method. allows the energy accumulated
in discharged instantaneously, and
therefore highly effective manner. For instance, the
sensitive device instead being in-series,
as shown, may shunt the condenser,
this modification being illustrated in',Fig.685,956
its resistance will diminished and the con
denser will charged the battery a
more rapid rate, enabling sufficient potential
energy stored the condenser during
5 the period inaction the device op
erate the receiver bring about any de
sired change the receiving-circuit when
the device acts.
It will observed that the condenser an
important element the combination.a condenser,
since these respects excels any other
storage device which have knowledge. this case the energy stored the 100
condenser passed through the primary of
a transformer, the secondary circuit which
contains the receiver, and order render
the apparatus still more suitable for use in
detecting feeble impulses, addition the 105
sensitive device which acted upon the
impulses, another such device included in
the secondary circuit the transformer. The condenser O', which 115
is generally made considerable capacity, is
connected two opposite points the bridge,
while battery series with continuous-
ly-adjustable non-inductive resistance r', is
connected the other pair opposite points, 120
as usual
