Improvements in Telephone Transmitters.
Year: 1898

page_text: Date of Application, 25th Oct., 1898-Accepted, 31st Dec., 1898
COMPLETE SPECIFICATION.
Improvements in Telephone Transmitters.
I, MAX BYNG, of Nos. 69-71-88-92, Queen Victoria Street, in the City and
County of London, Electrical Engineer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:<
My invention relates to improvements in attaching the hollow or cupped carbon
block to the base of a telephone transmitter, and the general arrangement thereof
to afford both electrical and vibrating contacts.
In order that my invention may be clearly rendered, I have appended the
accompanying sheet of drawings, in which Figure 1 is a sectional elevation and
Figure 2 a back plan view of a transmitter with a cupped carbon block fitted
thereto, according to my invention. Figure 3 is a sectional elevation and Figure 4
a plan view of a cupped carbon with a modified method of attachment to the base.
Similar letters of reference indicate corresponding parts throughout the several
views.
In carrying my invention into practice I construct a circular case or box B
which is surrounded by a metal casing D, or a similar casing of other material
if preferred. The carbon diaphragm is gripped between the casing D and the
box B and is protected by a gauze shield a. The cupped carbon block A is in
contact with a felt disc d and is surrounded by a resilient washer c, the cup C
containing granulated carbon. In order to hold said block A upon the base of
the box B, a central hole is cut or formed in A, with two or more side channels
or holes e e¹ and lead or other ductile metal is poured therein so that a left handed
screw thread may be formed centrally corresponding to a similar screw upon the
smaller end of the stud g. The projecting and larger end of said stud passes
through an insulating bush f and is secured by a suitable nut, making connection
between A and the connecting screw bolt by means of the plate h which is
insulated from the box B as shown by the black line in section. The opposite
screw bolt is in electrical connection with the box B, or may in some cases be
insulated. Screws E secure the casing D to the box B as shown.
An alternative method of attaching the carbon block A is shown by the
detached sectional elevation and plan views Figures 3 and 4. In this case the
smaller end of g is provided with serrations instead of a screw thread, and the
centre of A and the side channels e e¹ filled with lead or other metal as shown.
In attaching such carbon blocks to a base, there has hitherto been a disadvan-
tage in using the carbon material directly as a means for connection, therefore
the essential part of our invention is in the casting of a metallic plug therein
with lateral wings either forming a nut for a double threaded stud, or having a
stud cast therein with serrations for holding it.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed 1 declare that what
I claim is:-
-
First. In a telephone transmitter the construction and use of a carbon block
with a central orifice with two or more channels the whole of which
FIL

page_text: with molten metal, a stud being screwed or cast therein, substantially as herein
described and shown by the appended drawings.
Second. In a telephone transmitter the construction and use of a carbon block
with a central orifice having two or more side channels, filled in with molten
metal, a serrated stud being cast therein substantially as and for the purpose
set forth and shown by the appended drawings.
201
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicant.
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicant.