is
well known that when cells this kind are 70
exposed such rays greatly-varying in
tensity they undergo corresponding modifica
tions their electrical resistance; but the
ways they have been heretofore used they
have been very limited utility. The resistance r,
which may frictional inductive
one, not absolutely necessary; but of
advantage use order facilitate ad
justment, and for this purpose may made
60 variable any convenient and preferably
continuous manner.
55 secure the best results. will noted
that, shown Fig. Evi
dently, then, the receiver adjusted
that does not respond the comparatively
feeble normal discharges the condenser, if
30 they should occur, but only those stronger
ones which take place upon the diminution
of the resistance the sensitive device, it
will operated only when this device isact-
ed upon the disturbances, thus making it
35 possible investigate and utilize the lat
ter for any desired purpose. The battery should be
preferably very constant electromotive
force and intensity carefully determined. This condition readily secured a
proper selection and adjustment the vari
ous devices described, that the receiver
will remain unresponsive the feeble dis- 120
charges the condenser which may take
place when the cell acted upon but slightly
or not all the rays disturbances; but
if now new rays are permitted fall upon
the cell the intensity those already 125
acting upon increased any cause then
its resistance will diminished and the con
denser will charged the battery a
more rapid rate, enabling sufficient potential
energy stored the condenser during 130
the period inaction the device op
erate the receiver bring about any de
sired change the receiving-circuit when the
device acts.
The general principle underlying in
vention and the operation the various
devices used will clearly understood by
40 reference the accompanying drawings, in
Which—
Figure 1is diagram illustrating typical
arrangement apparatus which maybe used
in carrying method into practice, and
45 Figs. The sensitive device maybe any the
5 many devices this kind which are known
to affected the disturbances, impulses,
or effects propagated through the media, and
it maybeof sucha character that normally—
that is, when not acted upon—it entirely pre-
io vents the passage electricity from the gen
erator the condenser, may such
that allows gradual leaking through of
the current and charging the condenser
at slow rate. the receiving-circuit S5
is permanent connection with the battery
and condenser terminal and should be
stated that sometimes desirable en
tirely iusulate the receiving-circuit all
times except the moments when the device 90
d operates discharge the condenser, thus
preventing any disturbing influence which
might otherwise caused this circuit by
the battery the condenser during the pe
riod when the receiver should not acted 95
upon.
Iu Fig. will 105
once understood. any ease will seen
ig that the disturbances, whatever nature
they may be, cause appreciable diminu
tion the electrical resistance the sensi
tive device the current from the battery will
pass more readily into the condenser, which
20 will charged more rapid rate, and
consequently each its discharges through
the receiver, periodically effected the spe
cial device before referred which performs
this function, will stronger than nor-
25 maily—that is, when the sensitive device is
not acted upon the disturbances. Assuming that the dis
turbances which are investigated util
ized for some practical end are rays identical
with resembling those ordinary light,
65 the sensitive device may selenium cell
properly prepared, highly suscep
tible tlie influence the rays, the action
of which should intensified the use of
a reflector shown the drawings. and similar diagrams modi
fied arrangements apparatus for the same
purpose. This circuit, which
may called the receiving-circuit,” in- So
eludes the receiver B,and series with de
vice cl, before referred to, which performs the
duty periodically discharging the con
denser through the receiver. the rays acting upon the
. Normally—that is, when
it not influenced the rays all very
slightly—the cell being comparatively
high resistance permits only relatively fee
ble current pass from the battery into the no
condenser, and hence the latter charged at
too slow rate accumulate during the time
interval between two succeeding operations
of the device sufficient energy operate
the receiver or, generally speaking, pro- 115
duco therequired change the receiving-cir
cuit.685,954 3
and actuated any suitable force and are
adapted brought into and out con
tact with each other any convenient man
ner. such case two devices, cl, may
be used—one each connection from the
condenser the receiving-circuit—orelse one
single device this kind, bnt suitably-
modified construction, that will make 100
and break simultaneously and proper in
tervals time both the connections of
this circuit with the condenser and T'. addi- 75
tion the circuit including the sensitive de
vice cell another circuit provided,
which likewise connected the terminals
T the condenser. Cis condenser, the terminals
T and which connected charging-
50 circuit including battery sensitive de
vice and resistance all connected in
series, illustrated.
From the foregoing the operation the ap
paratus illustrated Fig
