The times dispatch. [volume] (Richmond, Va.) 1903-1914, 1907-03-03

the other. What makes this partjcu
lar instrument highly interesting no,
only to the scientist but also to the
legion of telephone users, is the fact
that its operation showed conciusively
for the first time that extremely feeble
electric currents flowing in the tele-
graph circuit could and would repro
sduce in the receiving instrument an
exact duplication of the sound made
by the transmitter.
LII the comparatively small area
which Will be occupied by this exhibit
and in the short space OF time which
II VIII take to look 1T over may be
traced the development OF the tee
phone. The visitor viii see ,..e first
form of telephone used commercially,
rough-looklng device with a wooden
mouthpiece. 1t VIII also be noticed
how rapidly the telephone developed in
other hands than Bells The exhibit
will show, through the various pieces
OF apparatus. tfat the inventors con-
ncction with the development OF tho
telephone lasted only for short time,
for here on exhibition Will be the Blake
transmitter. made in 1873, and improved
type after type until 1t gave way to
the White transmittcr now generally
used by the Bell companies mere
will also be on cxh.J.tion the trans
niitter which Thomas a. Edison de-
Nlsed. and also the same inventors
motophone, a transmttcr in which con-
tact is made through a moving cylinder
of moist chalk. Besides. there Will be
found the transmitter or hand tele-
phone produced by Elisha Gray and the
various forms of transmittcrs and re-
ceiyers intended for special uses.
Among these VIII be Included the tcle
phone which Bell made for fire alarm
purposes.
All the early Bell telephones were
box-like affairs. Srhen when Blufe in
troduced his transmitter, shich was
the out growth of the demand for trans
mission beyond the twcnty-milc limit
fixed by the first Bell company, the in
strument began to assume other forms
due to the necessity of having COM
bination OF 5transmitter and receiver
instead of the single instrument gen
orally used at first for both speaking
and hearing. The Blake transmitter
was also box-like In appearance, though
smaller than the Bell telephone. IN
developing the receiver. such as hangs
to-day by the side of the telephonelin
Office, factory and residence, attic Ms
demanded except a change In the eX-
terror form from the box to the Yul-
canite sheath, which was found TO be
best fitted for the purpose. he es-
sential features, such as magnet ana
diaphragm, We're retained, though on
n reduced scale. This fact may be
demonstrated by using the receiver to
talk through as we'll as to hear through.
It will be found that. as II d. IN the
earliest days, the single instrument
can serve a double purpose.
Altogether. there are some seventy
five pieces of apparatus dating from
1875 to the twentieth century. Some
of the Instruments representing spas
modic individual efforts, are of h-tle
or no practical value; but the majority
or them, and particularly those adopted
and used by the Bell companies, have
had much to do with the development
Of the telephone from crude device,
intended for use in small way 20 the
instrument now serving millions OF
neonle. and, so far as the Bell system
l. concerned, furnishing instant means
rof communication, for both social and
business purposes, from one place TO
thousands of other places within
radius of two thousand miles.