The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1898-05-01
ELECTRICAL NARVELS.
Some Interesting Features of New
York City's Electrical Exhibition.

At the coming electrical exhibition in
New York city the first extensive at
tempt to telegraph without wires inf this
country Will be made between the tower
of the garden. in the heart Of the city,
and the dome Of the Columbia univer-
sity on Morningside heights in Harlem.
Il will be made under the direction OF
Prof. Croker. OF the electrical depart
ment OF Columbia The apparatus 10 be
used VIII be the same as that used by
Aarconi. recently tested BY William
Henry Preess. OF the posi- osf.ce depart
ment of Great Britain. who succeeded IN
transmitting messages 20 some islands of
the coast OF Wales. although no wires
connected the islands with the mainland
The height of Madison square tower and
OF The dome Of Columbia is such that the
messages viii have very little material
substance TO Interfere with them en-
route. That IS. 1t will all be done above
the housetops. Not that houses or any
other substance of a Ike nature would
seriously interfere with the ether waves.
which transmit the impulses made in the
instruments The idea is to give the New
York public q chance actually 10 see and
to try the new system OF teiegraphing
through the ether without material means
OF communication. Audiences who Will
visit the garden during the experiment
will be allowed TO do some teissraphing
on their own account, so that the system
may be brought home TO them in as fore
!ble a manner as possible.
Another remarkable piece OF apparatus
TO be exhibited in the garden will be a
large and complete working model OF
Thomas A. Edison's iron mine Among
the Jersey hills Edison is crushing large
quantities oE magnetic. or magnetic rock,
and by means of magnets he is extract
ing the iron ore from the sand. The pro-
cess has been infinitely described. but few
people have chance 10 see the machinery
in actual operation, because tina Edison
mine is guarded strictly as the palace
Of the Russian czar, Edison has sent
large pieces Of the rock to Madison SQUARE
garden SO that the process may be placed
on exhibition. Five-ton rocks will be
dropped between a series of great rollers
and pulverized until nothing but dust Is
left. The resulting dust is dropped past
the faces of electro magnets which will
pun the iron ore out OF the sand and
cause 1t TO drop into bin by itself. The
sand OF course, viii pass right on. Thus
one of the newest tr.umphs OF the great
inventor viii be illustrated
Still another remarkable electrical in
vention il to be Illustrated at the Madison
square show. This will be the electric
welding process of Elhu Thomson, who
has succeeded by means OF the electric
arc in revolutiontz.ng the old process OF
welding. Mr.. Thomson practically has
created the blacksmith shop of the future
He has shown the old-style forge 10 be
very unnecessary institution. In order
10 weld nowadays IL Is only necessary TO
pass very powerful electric current
through the two pieces OF metal which
are TO be Joined together. In fact II two
pieces of metal are connected eacn 20 a
pole OF a dynamo and are then brought
together. the resistance of the metal at
the point where they are joined viii cause
them 10 fuse when a heavy carrent IL
passed through them. The process is now
being used by large manufacturers In va
rious parts of the country.