The same may
be said the resistance r', which series
with the battery and serves graduate the
force the latter, that the dielectric lay
ers the sensitive device are subjected 90
a similar strain and maintained state of
delicate poise. sufficient amount energy
being now stored this instrument during
the time interval between each two succeed- 120
ing operations the device cl, each closure
of the primary circuit the latter results in
the passage sudden current impulse
through the coil which induces corre
sponding current relatively high electromo- 125
tive force the secondary coil Owing to
this the dielectric the device gives way,
and the current the battery being allowed
to pass the receiver operated, but only
fora moment, since the rotation the de- 130
vices a', and cl, which may all driven
from the same shaft, the original conditions
are restored, assuming, course, that the
electromotive force set thedisturbances
. To
30 the terminals and the condenser is
connected coil usually consisting a
few turns conductor very small resist
ance, which the primary the transformer
before referred to, series with device cl,
35 which effects the discharge the condenser
through the coil predetermined inter
vals time. The various instruments be
ing connected and adjusted the manner de
scribed, will now readily seen from the
foregoing that under normal conditions, the 95
device being unaffected the disturb
ances, practically so, and there being no
or only very insignificant amount energy
stored the condenser, the periodical closure
of the primary circuit the transformer ico
through the operation the device will
have appreciable effect upon the primary
coil and hence currents will gener
ated the secondary coil least not such
as would disturb the state delicate balance 105
existing the secondary circuit including
the receiver, and therefore the latter will not
be actuated the battery B'; but when,
owing the disturbances impulses propa
gated through the media from distant no
source,an additional electromotive force, how
ever small, created between the terminals
of the device the dielectric layers the
same, unable support the increased strain,
give way and allow the current the battery r15
B pass through, thus causing difference
of potential the terminals and the
condenser.
The electromotive force the battery is
so graduated means the adjustable re
sistance that the dielectric layers the
sensitive device are strained very nearlj’
’ 75
to the point breaking down and give way
upon slight increase the electrical pres
sure the terminals the device. will
of course understood that the resistance
r" used mainly because convenience and 80
that may dispensed with, which case
the adjustment may effected many other
ways, determining the proper amount
or coarseness the sensitive powder by
varying the distance apart the metallic 85
plugs the ends the tube. The
tubular space between the plugs partially
to filled with conducting sensitive powder, as
indicated, the proper amount the same
and the size its grains being determined
and adjusted beforehand experiment. adjustment the speed ro-
55 tation the cylinder and displacement of
the brush along the axis the same the cir
cuit may made open and close rapid
succession and remain open closed during
such intervals time may desired. Its electrical resistance
is diminished when acted upon the
disturbances and automatically restored
upon the cessation their influence.
60 inductive relation the primary p
> a
secondary coil usually much thinner wire
and many more turns than the former, to
which are connected series receiver R,
(illustrated ordinary magnetic relay,)
65 eontinuonsly-adjustable non-inductive re
sistance r", battery properly deter
mined and very constant electromotive force,
and finally sensitive device the same
or similar construction which likewise
rotated uniform speed and which with its 70
brushes closes the secondary circuit. Another brush b', which connected
to the condenser-terminal T', being arranged
to bear upon the shaft will seen that
50 whenever the brush comes contact with
a conducting-segment the circuit including
the primary will completed and the con
denser, energized, discharged through the
same. This device the
present case one familiar construction,
consisting insulating-tube, which in
dicated the heavy lines the drawings and
5 which has its ends closed tightly two con-
ducting-plugs with reduced extensions, upon
which bear two brushes through which
the currents are conveyed the device.
The conducting part good electrical
connection with shaft and provided with
tapering segments, upon which slides a
45 brush 1
c, which should preferably capable
of longitudinal adjustment along the cylin
der. the present case this device
consists cylinder made partly con
ducting and partlyof insulating materiále
40 and e', respectively, which rotated the
desired rate speed any suitable means. is
of advantage employ round grains pow-
25 der the tube, and any event im
portant that they should uniform
size and shape possible and that provision
should made for maintaining unchang
ing and very dry atmosphere the tube.
This tube rotate clockwork other
15 means uniform and suitable rate of
speed, and under these conditions find that
this device behaves toward disturbances of
the kind before assumed manner simi
lar that stationary cell celenium to-
20 ward rays light.685,954 5
the sensitive device
