Wood County reporter. [volume] (Grand Rapids [i.e. Wisconsin Rapids], Wis.) 1857-1923, 1897-09-30

troduced lightning protector con-
structed like the above tube but made
OF DoXWood and containing powdered
carbon. 1t was fixed as a shunt to
the instrument to be protected. It
acted we'll, but it was subject to this
conference, which rendered the cure
more troublesome than the disease.
and its use had to be abandoned. The
same action is very common in gran
ulated carbon microphones like Hun
nings, and shaking has to be resorted
&c to decohere the carbon particles to
their normal state. Mons. E. Brandy
(1S90) showed that copper, aluminium.
and iron filings behaved in the same
way. Professor Oliver Lodge, who
has done more than any one else in
I'England to illustrate and popularize
the work Of Hertz and his followers,
has given the name "coherer'' to this
form Of apparatus. Marconi deco
here's by making the local current
very rapidly vibrate a small hammer
mead against the glass tube, which it
does effectually, and in doing so makes
/
characters is easy. The same current
| that decoheres can also record Morse
signals on paper by ink. The exhaust
ed tube has two wings which, by their
size, tune the receiver to the transmit
ter. Oscillations set up in the trans
mltter fall upon the receiver tuned in
sympathy with it, conference follows,
currents are excited, and signals made.
In open, clear spaces within sight of
each other nothing more is wanted.
but when obstacles intervene and great
distances are in question height is
needed, and tall masts, kites and bal
Icons, have been used. Excellent sig
nails have been transmitted between
Penarth and Brean Down, near West
| on-super-Mare, across the Bristol
channel, distance of SO miles.
! 1t is curious that hills and appar-
ent distractions fail to obstruct. The
reason is probably the fact that the
lines OF force escape these hills. When
the ether is entangled in matter of diff
Ierent degrees Of inductivity the lines
are curved, as in fact, they are in light
fig. shows how hill is virtually
brldged over by these lines, and con-
sequently some electric waves fall on
the relay. Weather seems to have no
influence; rain, fogs, snow and wind
avail nothing. The wings shown in
Fig. z may be removed. One pole can
be connected with earth and the other
extended up to the top Of a mast or
FASTENED q INV
wire. The wire and balloon covered
with tin foil or kite becomes the wing.
In this case one pole of the transmit
ter must also be connected with earth.
This is shown by Fig. 5. There are
some apparent anomalies that have
developed themselves during the ex-
perlments. Mr.. Marconi finds that his
re:ay acts even when it is placed in a
perfectly closed metallic box. This
IS the TACT that has given rise to the
r"mor that he can blow up an iron
clad ship. This might be true if he
could plant his properly tuned receiv-
eli IN the magazine of an enemy's ship.
Inc distance TO which signals have
Dcen sent is remarkable. On Salisbury
PLAIN, Mr.. Marconi covered a distance
OF four miles. in the Bristol channe!
tIis mas been eXtenGed TO over eight
mules, ana We have by no means
reached the limit.
1t IS easy to transmit many mes
sagcs III any direction at the same
time. 1t is only necessary to tune
the traGsmitters and receivers to the
same frequency, or note There are
a great many practical points connect
ed with this system that requires to be
threshed out in practical manner be-
fore it can be placed on the market.
bu1 enough has been done to prove it's
value and to show that for shipping
and lighthouse purposes it will be
great and valuable acquisition. Mod
ern Machinery, Chicago.