The Houston daily post. [volume] (Houston, Tex.) 1886-1903, 1900-05-09

provided the circuits -.
Ihere must be a shor, 40 %! d
spark-gap In the 6rs, spAsknr
means means for exciting tho ", w., univ
.u 7, OF the ether, sua III, x. ,slts
similarly arranged, becs s sns issa
ether waves, responds. : M
riod. "a 's own No..
!, In n all his experiments M.
OF sympathetic or reason neltt ~
exeter was the spars ling arin
two polished balls ON .,i vsasslnl NJ
break in the discharrinsa 's HIds
was fed by the actIon circuit
Ruhmkorff coil. The de,.s !. y N.
cal eye," as Lord Kelvss ',l q
was usually a simple reet.n =, s'q
VI zinc, In this wire ths.s slsls o.
with knob or bali on San s VA
distance between the kpoh sa slas "
ulated by a micrometer 80 e0rN
. .IIi ; detector would respond ~ s,,,, A
siderable range. the spsrl. ''aa
maximum for a partlculsr ~ ~ festll(
which the natural periods ...,'neI
and the detector were th. y " u
provement made by later ' -
consists In keeping the sn.,s s'tSlp
Immersed in oil. This prey Ssr. lsvaI
ening OF the surface ana sa. s w N
the same action as thar !, an y
interruption. = 'ne elssnd
properties OF Ether wa.
By means OF these simple ss,,'''
made complete investigate. !.
properties Of electric waves i. /,
lie found that they were relect.a I ;
tallic surfaces, but passed ,h,...,
and stone and other insulating Nv.
ana he succeeded In refractir, ~
great prism of pitch lust a i,s ss.l
iracted by a prism OF glass b"
ured the length of waves and ~,
which was the same as that n MI
the course OF lecture delivered !. 4
after this Lodge said, referrlus = /.
waves OF this kind: They can \. Y.
by plane sheets of metal, cour.r,,'..s
parabolic reflectors, refracted Nv y.
HERTZ SPARK-GAP DETEcySs
concentrated by lenses. / bays
college a large lens Of pitch ,',.j
over three hundredweight, for eoa, ~.
Ing them to a focus, They can b, N
TO show the phenomena Of in,,-s..]
and thus have their wave len.,h, NJ
rately measured. They are STOPPED !, \
conductors and transmitted BY Al N
lators. Metals are OPAQUE, but ~, \
perfect insulators such as wood !, 4
are strikiDgly transparent, and NINA y
be received in one room from ,or,,
another, the door between the Two u,
shut"
Space telegraph.
This was the germ OF space telsrs.
in its present form. The ware d nd
by suitable apparatus, travels throsi 1,
ether with the speed Of light and i I.
celved by other devices much more va
tive than that used by Hertz Thes a
be described later
AS the ether waves are abnrt.l
conductors, the action in the usual u:i!z
OF signaling With wires is evldenty Il
a special case, in which the ethe. Mld
started at the transmitting end III y
oeived by the wire OF the circuit To- 4
penetrating the wire iron \
outside, and in this way much In
Of the energy is used shfa
is wanted than in any system Ii ~
wire circuits are dispensed with. MM
actions may be roughly compared y u
transmission OF second waves iror q
point to another by shouting In Ii. ~
air and by talking through spsit;
tube. ~
A method OF signaling through ~
which may be considered tc lle bSEs1
the ordinary system with wire it'd
and the modern wireless telesrafsy
that which has been used 20 signal %
ing trains. The ca. containing The Haf
Ing apparatus was lifted with win 70
ming the length OF the roof OF th' Y
and the message wac trasmktet, frn =
pole line running alongside the M
the wire on the car, by Induction iiisv
space separating the two. This Va y
propagation OF true ether wave cls'4'
from tho latest methods chiefly =
period ard wave length II the disturb,
and in the sensitiyeness and arraDlsl'
Of the apparatus responding TO u
Tho development Of the netna z
designated by the nans N 4,
less telegraphy" will be described y =
next paper.