give an
idea, would say that the frequency should be
4° smaller than twenty thousand per second,
though shorter waves might practicable.
Third. but one plate con
nected earth and the other maintained j30
. The powerful electrical
oscillations the system being com-
5 inunicated the ground cause correspond
ing vibrations propagated distant j
parts the globe, whence they are reflected :
and interference with the outgoing vibra
tions produce stationary waves the crests:
io and hollows which lie parallel circles j
relatively which the ground-plate may i
be considered the pole. For the present will suffi- j
20 cient state that the planet behaves like j
perfectly smooth polished conductor in
appreciable resistance with capacity and self
induction uniformly, distributed along the
axis symmetry wave . More than.propagation and
25 transmitting slow electrical oscillations with
out sensible distortion and attenuation. Stated other- :
wise, the terrestrial conductor thrown into I
resonance with the oscillations impressed i
15 upon just like wire. The object using two brushes,
as and //, each the holders and 95
to vary will the duration the electric con
tact the plates and with the terminals
T and which connected receiving-
circuit including receiver Rand device <
!,
performing the duty closing the receiving- 100
circuit predetermined intervals time and
discharging the stored energy through the re
ceiver.
35 Second. the present case this device con
sists cylinder made partly conducting
and partly insulating material <
■and <
■
', re- 105
spectively, which rotated thodesiral rate
of speed any suitable means. consists a
cylinder of' insulating material, which is
moved uniform rate speed clock
work other suitable motive power and 80
provided with two metal rings upon
which bear brushes <
1 and </, connected, re
spectively, the terminal plates anil P'.
30 First..
in Fig.
Besides the above three requirements seem
to essential the establishment the
resonating condition.this, j
number facts ascertained clearly ]
show that the movement electricity through !
it follows certain laws with nearly mathemat- i
ical rigor. Another way connect
a tuned circuit the ground two points
lying more less meridian passing 70
through the pole or, generally stated, to
any two points different potential. The con
ducting partr good electrical connection
with the shaft and provided with taper
ing which slides brush 110
/•, supported conducting-rod capable
of longitudinal adjustment metallic sup
port «>.08484 second and which taken in
passing and returning from the region dia
metrically opposite the pole over the earth’s
60 surface with mean velocity about four
hundred and seventy-one thousand two hun
dred and forty kilometers per second.
With oscillations still slowerthe earth, strictly
speaking, will not resonate, but simply act as
50 capacity, and the variation potential will
be more less uniform over its entire surface. The latter are connected 90
the terminals and condenser II, and
it should understood that they are capable
of angular displacement, ordinary brush-
supports. have shown device for detect
ing the presence the waves such have
used novel method magnifying feeble 75
effects which have described Patents
Nos. 685,953 and 685,955.. For instance, a
65 circuit may connected directly induct
ively the ground and elevated termi
nal and tuned respond more effectively to
the oscillations. adjustment,
of the speed rotation the cylinder <
!and
a displacement the brush /<
■along the cyl- 120
inder the circuit may made open and
close rapid succession and remain open
or closed during such intervals time may
be desired. necessary employ oscilla
tions which the rate radiation energy
into space the form hertzian electro
magnetic waves very small.
The presence the stationary waves may
he detected many ways.) are brought alternately into
contact with double brushes and //, carried
by and contact with conducting-holders-/*
and //, supported metallic bearings and
(4', shown.and fourtimesthe
frequency the currents. Another brush, arranged bear
upon the shaft and will seen that when
ever one the segments/"' comes contact 115
with the brush 1‘the circuit including the re
ceiver completed and the condenser dis-
chargeddhrough the same.
The lowest frequency would appear six
per second, which case there will but
one node, ator near theground-plate, and, par-
45 adoxical may seem, the effect will increase
with- the distance and will greatest a
region diametrically opposite the transmitter. Theearth’sdiamctcr passing through
the pole, should odd multiple the
quarter wave length—that is, the ratio be
tween the velocity light.787,412 3
tricity give rise variety novel and Í
striking phenomena, among which are those I
already described. The plates and P', through
which the electrical energy conveyed the 125
brushes and <
/■
', may considerabledis-
tance from each other the ground one in
the ground and the other the air, prefer
ably some height. The most essential requirement is,
however, that irrespective frequency the
wave wave-train should continue foracer-
55 tain interval time, which have estimated
to not less than one-twelfth probably
0.
From the rings extend narrow metallic
segments and which by'the rotation 85
the cylinder I
