Washington standard. [volume] (Olympia, Wash. Territory) 1860-1921, 1878-07-13

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senf gse~a DISTANCES ssssx wires
Tais was jass What Mr.. Bell wanted
He said o. hiEseif, The soand 1t ay
vuice xill give metinn 90 thin plxie Il
iron a. well rs tn sheet # gsidbeatcrs'
akin, and il I LING this vibrating plate
of iron close 10 q magnet, the mofis'n will
set up in its waves Of electricity answer
ing exactly to the sound-wsves which
move the iron plate"
But the ins nmeut must not only trans
late sound weVes into electric impulses;
it must also change these back again into
sound-waves; it must not only hear, but
also 4psakl
You remember our 6rst fact in regard
to sound; it is caused by motion. All that
is needed to make anything speak il to
cause it to move SO as to give rise to just
such air-waves as the voice makes. Mr..
his sound-receiver speak.
He reasoned in this way: From the
nature of the magnet it follows that when
waves of electricity are passed through
the wire coil around the magnet, the
strength Of the magnet must vary with
the force of the electric impulses. Its
pull on the plate of iron near it must
vary In the same manner. The varying
pull on the plate must make it move, and
this m0vemsnt must set In motion the cir
near the peale IN ound-wsves correspond
ing exactly with the motion setting up
the electric waves in the first place; in
other words, the ound-motion 10 one
telephone must be exactly reproduced as
in q similar instrument
joined to it by wire.
Experiment proved the reason correct
and thus the neutrality-suspicious. was in
vented.
The receiving and sending instruments
are precisely alike, each answers for both
purposes; but there must be two, since
one must always be hearing while the
other is speaking.
When you speak into the mouth piece
of Bells telephone, the sound Of your
voice causes the diaphragm" to vihrate
in front Of the magnet. The vibrations
cause the magnets pull upon the dia-
phragm to vary in force, which variation
is answered by electrical waves in the
coil and over the wires connected with it.
At the other end of the wire the pull If
the magnet of the speaking telephone is
varied exactly in proportion to the
strength of the electric impulses that
come over the wire; the varying pull of
the magnet sets the diaphragm in mo-
ton, and that sets the air in motion in
waves precisely like those of the distant
voice. When those waves strike the
listeners ear, he seems to hear the speak
ers exact tones, and so, substantially, he
does hear them.-X. r., in st. Nicholas.
The Prince of Wales has won golden
opinions as the President of the Royal
Commission il Paris, taking as active
y part ~ royal dignity would per-