TELEPHONIC TRANSMITTING INSTRUMENTS
Year: 1885

page_text: I GEORGE LEE ANDERS of 90 Worship Street Finsbury in the County of
Middlesex Electrician do hereby declare the nature of my said Invention for
TELEPHONIC TRANSMITTING INSTRUMENTS to be as follows:-
The improved instruments which constitute my present Invention belong to
that class of Telephonic Transmitters wherein is no diaphragm or tympanum to
transmit the vibrations to the Electrodes but wherein the air waves of the voice
act directly upon the Electrodes or contact pieces themselves-According to my
Invention I make the electrodes extremely light so that they are easily moved by
the sound-waves and they are also constructed so as to be loose and unconfined in
those planes in which they are required to move in order to vary the contact when
the sound waves act on them-Rods or thin tubes of Coke Carbon or other suitable
material are particularly adapted for use as electrodes according to my Invention-
The said Electrodes rest upon suitable supports in a free manner by their own
weight having no adjustment but are prevented from falling by suitable frame-
work or supports or they may be supported by pivots thrust loosely into their
ends through suitable supports. The aforesaid electrodes may lie all in one plane
or they may lie in many planes but always so that the sound waves shall tend to
act on them as nearly as possible simultaneously The said Electrodes may be
thickened at the ends if desired and may be of any suitable form in cross section.
The sound waves may be directed upon or amongst them by 'means of a suitable
mouth piece or tube and I interpose in some cases a sheet of oiled silk or other
waterproof fabric between the speakers voice and the mouth piece or tube and so
arrange it as to cut off the moisture of the breath without taking up the vibrations
from the air waves as a diaphragm or tympanum.
DL

page_text: Telephonic Transmitting instruments.
I GEORGE LEE ANDERS of 90 Worship Street Finsbury in the County of
Middlesex Electrician do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:—
The improved instruments which constitute my present Invention belong to
that class of Telephonic transmitters wherein is no diaphragm or tympanum to
transmit the vibrations to the electrodes but wherein the air waves of the voice
act directly upon the electrodes or contact pieces themselves-According to my
Invention I make the electrodes extremely light so that they are easily moved by
the sound waves and they are also constructed so as to be loose and unconfined in
those planes in which they are required to move in order to vary the contact when
the sound waves act on them. Rods or thin tubes of coke carbon or other suitable
material are particularly adapted for use as electrodes according to my Invention
The said electrodes rest upon suitable supports and against each other in a free
manner by their own weight having no adjustment but are prevented from falling
by suitable framework or supports or they may be supported by pivots thrust
loosely into their ends through suitable supports-The aforesaid electrodes may lie
all in one plane or they may lie in many planes but always so that the sound
waves shall tend to act on them as nearly as possible simultaneously The said
electrodes may be thickened at the ends if desired and may be of any suitable form
in cross section-The sound waves may be directed upon or amongst them by
means of a suitable mouth piece or tube and I may interpose a sheet of oiled silk
or other waterproof fabric between the speakers voice and the mouth piece or tube
simply arranging it so that it serves to cut off the moisture of the breath from the
rods or the like without acting as a diaphragm or tympanum.
Figures 1, 2 and 3 of the accompanying Drawing represent respectively a plan
of underside and sections at right angles to each other of a transmitter arranged
according to my Invention.
A are carbon rods or tubes arranged loosely in supporting loops or bars of metal
or conducting material B fixed in the underside of the mouth-piece C or in or to
other suitable support-The battery wires are attached the one to one of the loops
or bars B and the other to other of the said loops or bars; bare ribs to keep the
rods in place.
Figure 4 is a modification wherein the bars B also act as retaining ribs-The
rods or tubes A are free to rest on the supports B and against each other but there
should not be sufficient play allowed to allow of them getting over each other.
There should be in the supports B easy room only for a single layer of the rods
or tubes,
The transmitter may be mounted in any suitable way but I prefer to mount it
desk fashion as shewn in Figure 2 I prefer to face the supports B with platinum
foil for the contact of the carbon rods or tubes.

page_text: Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
First. A telephonic transmitter consisting of a number of rods or tubes or the
like of carbon lying loosely on or in conducting supports and against each other
so that the conducting supports are bridged by the said rods tubes or the like
substantially as herein before described.
Second. The constructions of telephonic transmitters hereinbefore described and
illustrated in the accompanying Drawings.