The news and herald. (Winnsboro, S.C.) 1877-1900, 1877-04-07

periments followed. Taking
magnet with. two wires attached the
Professor placed it upon q small
circular wooden ''bar," then nut
both upon the sounding board OF
another piano that had been placed
upon the stage. Ina few seconds
the strains of "Old Hundred" were
heard hoard all oyer the hall, like
the lower notes Of small organ,
gracefully re-echoing, as it were, the
sounds from Philadelphia. Another
ordor and the full chords Of the
"Doxology" were plainly distin-
gulshablc, tho chords being as per-
feot as though tho performer had
been on the stage with the appara
tus, first two, thop three, four and
five, demonstrating the wonderful
scope to which the instrument can
bo adapted and tho possibility Of
playing some very intricate music.
This delighted the audience better
than anything that had boon done
previously, Hymns were then
played, God Save the Queon," tho
"Conquering Hero" eve Won't go
Home Till Morning" "Suwanee
River" and numerous other pleasing
airs afterwards delegated the audi
dence
Finally Mr.. Gray tested the
audience as circuit. A common
transmitter was connected to the
battery and hold by the Professor,
who placed his forefnger against
disk faced with zinc, shaped like the
human ear. The gentlemen then
assembled the stage and formed a
circle, one holding the wire, the
others all joining hards, ard the
last ono of the circle on the opposite
side, olasping the wrist of the Pro,
fessor. Tho disk was started, and
the air of Nioodemus" was produced
through this human current, start
ing from the ono holding the wire
and ending at the tip Of the Profes.
sors Anglers, from which the air
was emitted. clear and distinct,
Altogether 1t may be said that this
new instrument, when worked with
a full battery, will repeat melodies
in tho sweetest and softast manner,
The rehearsal was most decided
success.
THE THEORY OF THE TELEPHONE
stripped aa nearly as possible of
technical terms, is as follows:
Sound is the final effect produced
on the ear by vibration or impulse
transmitted through any elastic
medium, aerial, liquid or solid.
When n sudden blow is delivered
to the air, the impulse is propaga-
ted through the air and ultimately
reaches the eur as a noise. The
energy of the shock Of propagation
determines tho loudnQas Of tho noise
resulting. This can be illustrated
by dropping n pebble into the centre
of a large pond of still water. Where
the pebble strikes the surface O.
shock is administered. Immediately
q circular wave is developed which
extends more or less rapidly from
the point Of it's generation and con>
tlnues to propagate itself, until it
meets with some obstruction. In
like manner wave is propagated in
q volume of air, and is transmitted
from particle to particle of the
atmosphere until it meets with
some obstruction, as in the case Of
the wator wave. It must be remem,
berad that a noise is the result Of q
single impulse or OF d series Of
irregular impulses upon tho air.
or a musical nota can be
generated only by regular success
sion OF impulses forming D aeries Of =
rapidly recurring wavesih the air,
The rapidity of these vibrations
decides the pitch of tho note, when
there are less than forty vibrations
q second, the musical tone ceases, VI
and only a futtering sound ish card
If the number exceed 10000 q
second, the noiso becomes q ahriek,
Tho actual range in music rarely
passes above 5000 vibrations per
second, but sometimes in organ
pipos falls below forty. The human
ear contains q thin membrane
stretched and tho vibrations it
receives from contact with vibrating
air causes the sensation of hearing.
for sound. Now for the ap-.,
plcation ofelectricity to transmit it
1t is we'll known that, if q coil of wire
be wrapped around bar of soft
irn., o,,I N o,,,.ox,k - oJooAssoSl~. =,