Telephone-Transmitter. Page: 2 of 2
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UNITED STATES PATENT OFFICE.
HORACE C. ALEXANDER, OF BONHAM, TEXAS.
TELEPHONE-TRANSMITTER.
SPECIFICATION forming part of Letters Patent No. 582,513, dated May 11, 1897.
Application filed December 4, 1896. Serial No. 614,440. (No model;)T'o all whom it may concerrb:
Be it known that I, HORACE C. ALEXANDER,
of Bonham, in the county of Fannin and State
of Texas, have invented a new and Improved
5 Telephone-Transmitter, of which the follow-
ing is a full, clear, and exact description.
This invention relates to transmitters for
telephones, and the object is to provide a
simple and effective transmitter of the granu-
io lated-electrode type so constructed that the
granulated electrode cannot become displaced
from the cell.
I will describe a transmitter embodying my
invention and then point out the novel fea-
15 tures in the appended claims.
Reference is to be had to the accompanying
drawings, forming a part of this specification,
in which similar characters of reference indi-
cate corresponding parts in both views.
20 Figure 1 is a plan view of a transmitter em-
bodying my invention with a portion of the
diaphragm broken away, and Fig. 2 is a cross-
section thereof.
Referring to the drawings, 1 designates a
25 metallic shell having an annular flange 2, pro-
vided with perforations through which screws
may pass to secure the transmitter to the door
of a transmitter-box. The shell is open at
its front, and its rear wall has a central open-
30 ing 3. Arranged within the shell is a carbon
disk 4, provided with a central cell 5, which,
as here shown, extends entirely through the
disk. The disk is also provided with a series
of cups or cells 6, and in the several cells is
35 placed a granulated electrode 7-such, for
instance, as granulated carbon. Arranged
on the back of the shell is a block of insulating
material 8, and this block is secured in place
by means of screws passing through the bot-
40 tom of the cells 6 and also through the metal
back of the shell. From a central plate 9 on
the back of the block 8 a post 10 extends
through the cells 5, and to the inner end of
the post 10 is secured the diaphragm 11, with
45 which the granulated material 7 contacts.
Arranged between the diaphragm and the
carbon disk is a layer of soft textile material
12--such, for instance, as felt-and this softmaterial is secured to the carbon disk by
means of a suitable cement. By cementing 50
the soft material in place it cannot become
crimped or displaced and thus allow the es-
cape of the granulated material in the cells,
and this interposed soft material will pre-
vent rattling of the diaphragm. 55
' I do not confine my invention to any par-
ticular number of cells in the carbon disk,
neither do I limit my invention to the par-
ticular means shown and described for fasten-
ing the diaphragm in place, as a main feature 60o
of my invention resides in securing the soft
material to the carbon disk by means of an
adhesive.
Having thus described my invention, I
claim as new and desire to secure by Letters 65
Patent-
1. A telephone-transmitter, comprising a
metal shell open at its front and having a
central opening through its rear wall, a car-
bon disk in the shell having a cell extended 70o
through it in line with the opening through
the back of the shell, a block of insulating
material secured to the back of the shell, a
granulated electrode in the cell, a post ex-
tended through the cell, a contact-plate in 75
engagement with the rear end of the post, a
diaphragm in the shell and having a contact
with the post and shell, and a soft textile ma-
terial between the diaphragm and carbon
disk, the said textile material being cemented 80
in-place, substantially as specified.
2. A telephone-transmitter, comprising a
metal shell open at its front and having a
central opening through its rear wall, a car-
bon disk in said shell and having a central 85
cell extended through it, and a series of cup-
like cells, granulated electrodes in the several
cells, a diaphragm having electrical connec-
tion with a contact-plate and with the shell,
and a soft textile material between the dia- 90o
phragm and carbon disk and cemented to said
disk, substantially as specified.
HORACE C. ALEXANDER.
Witnesses:
JAS. R. MCKINNEY,
D. W. SWEENEY.
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Alexander, Horace C. Telephone-Transmitter., patent, May 11, 1897; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth174611/m1/2/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.