The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1877-03-10
THE TWO TELEPHONES.
PROFESSOR GREY's INVENTION SENDS MUSIC
FROM CHICAGO TO DETROIT.

PROFESSOR GREY 3 INVENTION SENDS MUSIC
FROM CHICAGO TO DETROIT.
II Is 2s4 miles from Chicago to Detroit and on Tues
day evening, Narcn o, u successful experiment with
the musical telephone was made between tho two
cities Tho instrument used was that invented by
Professor Elisha Grey, and II Is somewhat different
from the instrument invented by Professor Bell, OF
Cambridge, Mass The Detroit Free Press says that
tho distance between the two cities the longest
circuit yet tried aud the experiment entirely
ccssfu Mr.. N. G. Kellogg was introduced the Ice
turer OF tho occasion, and he gave the following In
tercsting facts about the two kinds OF telephones and
the principles OH which they work Tho word 'tee-
phone primarily, means TO make musical sounds at
distance. In lis secondary meaning Is applied ~
the apparatus which sends musical sounds telegraph
cally by OF electricity, electro magnetism and
certain acoustic appliances. When noises are
pcatet in regular order, at certain rate per
second the result Is musical sound of some value
other. For instance, when sound Is repeated ut
the Of 800 times per second the result Is certain
musical note or sound TO which name may be gwen
Whenever any other person produces sound at tho
rate per second he reproduces this musical sound
Sounds repeated At tho rate OF 500 times second
produce another musical sound. sounds repeated at
tho OF 700 times second produce still another
musical sound and SO on II asystem can DC devised
that person IN Chicago can produce sounds IN De-
tro at the ratio OF 800, 500 700, 700 or any other
number vibrations pleasure the theory OF the tee
phone which have defined 10 mean tho production OF
musical sounds at distance, has been accomplished
This Sir. Grey has done How he has accomplished
this shall attempt 10 explain We all Know that when
q OF electricity passes ia many convout ons
around piece Of soft IRON the iron becomes magnet.
or IS endowed with magnetic power When
the current OF electricity Is interrupted tho
power Is lost On thus action OF natural
forces Is based the usual application of electricity 10
tciegraphy and other useful arts twas poticed by
Charles Grafton Page, couutryman OF ours who has
great reputation an electrician as long ago AS 1884,
that the instant when tho iron Of the electro magnet
magnetized there was thud sound and another
thud or sound ut the instant when the iron was de-
magnetized All who are Interested can Ind this
mentioned in lyudall's Notes on Electricity" rcpub
llshed In this country II was aiterward noticed by
very careful measurement, that the bar OF iron Is
elongated when magetlzed and returns 10 It's original
length when demagnctzed. This is due to molecular
action and Is the cause OF the thud or sound noticed
by Page. IL Is we'll known that man In Chicago can
magnetic and demagnetize piece OF iron IN Detroit
by means OF the and telegraph wires
He can thus make the molecular mud or sound, OF
which have spoken. II he can magnetize and de-
magnetic the iron and make tho thud or
sound at given rate per second, no can
reproduce in Detroit given musical sound.
by means OF Mr., Grey's transmitter ap;,
explain he has been able to accomplish this TO great
perfection. VIII now explain the receiving apparatus
by which music played Ut Il distance is made audible
here II consists OF large sounding box, on winch Is
mounted electromagnetic OF suitable construction.
The box enarges the noise OF the thad or sound which
takes places musical rate Ia tho iron There Is still
another principle involved. OF which Mr. Grey makes
Use. mentioned the elongation Of the iron at tho
time OF magnezation. Mr. Grey constructs his up
partus That the strikes tho box at each conga
ton. We have thus The molecular thud and the sound
of the flow combined, aud the sounding box enlarge
and make audblo the otherwise minute sound. The
transitter, which ~ now IN Chicago and from which
will be transmitted tho music you VIII hear tonight
OF key board OF Two Octaves ana tuning bar,
electromagnetic and electric circuit. With the key
"C is the bar tuneu to &C. with I'D" tue bar tuned
to 3D." &c When tho key ''C' IS depressed the cleo
trio oil Tho local battery at Chicago acts upon
It's corresponding electro. magnet, which sets the
bar ssC' INTO vibration, corresponding with Its
fundamental. This vibration continues as long
the key Is depressed only. Each forward motion OF
the by means oil contact points suitably arranged
puts the telegraph line from Chicago W Detroit
electric battery power. Each return OF the bar takes
the battery Oft The vibration OF the bar &c" thus
transmits 10 the line number of electric impulses
corresponding TO its fundamental These act uuon the
magnet III Detroit to "a number OF times corrc
spending 10 tho fundamental Of the tuning bur at Chi
cago, producing musical sound in the manner OK
piaineu. The key OF app acted upon will produce tho
sound I'D" Detroit, and tho key "F the sound IF !"
II the keys ''D'' and "F both depressed at the
same time, both OF electric Impulses exist in the
the time, and both are madc audible by
the here. Owing TO complications OF electric
circuits which II Is not necessary explain the appa
ratus uniting tunes Is constructed that but
tone Is put 10 wire al u time. In Mr. Grey s
system Of multiple TRANSMISSION OF sounds tor tclc-
graphic purposes MS many eight ana sixteen tones
have coeXsted In wire at tho same time and all have
been received perfect order at the receiving end
PROFESSOR BELL, OF BosroN,
has been working IN the same field To some extent
Latery he has been paying attention to the transmits
vocal sounds geographically, and his results
have been extensively noticcd III tho papers. Many
OF the principles which Mr.. Bell employs the
as those which Mr. Grey uses. MIR. Grey's thoughts
we're early turned in direction which Mr. Bell has
recently taken. He did not follow the subject as
thoroughly he did the subject VI multiple transmits
sion because no did not see tho ultimate good which
come from 1t. Ii Mr. Boil develops this branch
OF the subject practical results Mr.. Grey
will be III TO give him credit for what belongs to
him | mention Mr. Bell because many have cou-
founded tho labors OF the TWO, and IL Is we'll TO bear