IMPROVEMENTS IN TELEPHONIC TRANSMITTERS
Year: 1885

page_text: I GEORGE LEE ANDERS of 90 Worship Street Finsbury in the County of
Middlesex do hereby declare the nature of my said Invention for "IMPROVEMENTS
IN TELEPHONIC TRANSMITTERS "to be as follows:-
My Improvements consist in arranging the contacts of the Transmitter so that
whilst one of them is actuated by the Diaphragm the other is held against it in
the requisite manner by being imbedded in or attached to a yielding mass of cork
or other suitable material the said mass of yielding material being maintained in
its proper place by gravity or by a suitable arrangement of elastic levers, and in
cases where gravity is made use of a heavy weight may be pivotted or suspended
in any suitable way and the mass of yielding material held in or against or upon
the heavy weight or to its support or to any suitable arm or projection attached
thereto but always so that the tendency of the heavy weight to return to its
lowest position shall keep the mass of yielding material in or near its neutral
position And further in order that the mass of yielding material may be
prevented from ever being displaced more than a minimum distance from its
normal position I provide a suitable stop or stops which may be adjustable or
not, by means of which I limit the movement either of the said heavy weight
or of the yielding mass attached to it--And in some cases instead of imbedding
the contact piece or pieces directly in or attaching it or them directly to the
said yielding mass I attach them indirectly,-for example, I may imbed a piece
of ivory or equivalent material to which I attach the said contact piece or pieces
and I find that amongst good conductors palladium is very suitable for the
purpose of making contact surfaces. In place of the aforesaid heavy weight a
spring can be employed in an equivalent manner.

page_text: Improvements in eepromicans
I GEORGE LEE ANDERS of 90 Worship Street Finsbury in the County of
Middlesex Electrician do bereby 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:-
My Improvements consist in arranging the contacts of the transmitter so that
whilst one of them is actuated by the diaphragm the other is held against it in
the requisite manner by being imbedded in or attached to a yielding mass of cork
or other suitable material the said mass of yielding material being maintained in
its proper place by gravity or by a suitable arrangement of elastic levers or
suspenders and in cases where gravity is made use of a heavy weight may be
pivotted or suspended in any suitable way and the mass of yielding material held
in or against or upon the heavy weight or to its support or to any suitable arm or
projection attached thereto but always so that the tendency of the heavy weight
to return to its lowest position shall keep the mass of yielding material in or near
its neutral position and further in order that the mass of yielding material may
be prevented from ever being displaced more than a minimum distance from its
normal position I provide a suitable stop or stops which may be adjustable or not
by means of which I limit the movement either of the said heavy weight or of
the yielding mass attached to it And in some cases instead of imbedding the
contact piece or pieces directly in or attaching it or them directly to the said
yielding mass I attach them indirectly for example I may imbed a piece of ivory
or equivalent material to which I attach the said contact piece or pieces and I find
that amongst good conductors palladium is very suitable for the purpose of
making contact surfaces. In place of the aforesaid heavy weight a spring can be
employed in an equivalent manner.
And in order that my said Invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer to
the several figures on the annexed sheet of drawings the same letters of reference
indicating corresponding parts in all the figures.
Figure 1 represents in vertical section a transmitter constructed or arranged
according to my Invention. A is the mouthpiece and B is the diaphragm prefer-
ably of ebonite or other nonconducting material attached to the mouthpiece A by
means of the ring b and carrying one of the contacts c preferably consisting of a
screw adjustable in a nut fixed in the diaphragm and tipped with polished
palladium or platinum. One of the wires d from the battery is connected to this
contact The other contacte is carried in a body f of cork or other material of an
equivalent nature slightly compressible and not having tone like a spring. The
body fis mounted in a disc g of -brass. or other conducting material forming the
heavy weight by which the contacts cand e are maintained in their proper normal
position. The disc g is suspended by a conducting wire or rod h to the metal
bar provided with pivots which rest on metal brackets j to one of which the
other wire is attached The brackets j are fixed to the back connected to the
mouthpiece in any convenient way. n is a metal strip for conducting the current

page_text: from the body g to the contact e When the sound waves act upon the
diaphragm B. there is molecular making and breaking going on at the contacts
the inertia of the pendulum keeping the requisite pressure of the contacts and
preventing too great excursion of the contacts. This latter may be ensured by
means of a screw as at m in dotted lines in Figure 1.
Having now particularly described and ascertained the nature of my said
Invention and the manner in which the same is to be performed I declare that
what I claim is,
First. A telephonic transmitter constructed or arranged substantially as and for
the purpose hereinbefore described.
Second. In a telephonic transmitter the combination with a contact carried by
the diaphragm of another contact carried in or by a pendulum or weight with
the intervention of cork or an equivalent body substantially as hereinbefore
described.
Third. A telephonic transmitter wherein one of the contacts is actuated by the
diaphragm and the other contact is mounted in or attached to a yielding body
of cork or other suitable or equivalent. material and maintained in proper normal
position relatively to the first contact by gravity elastic levers or equivalent
devices substantially as herein before described.
Fourth. The arrangement and combination of parts constituting the telephonic
transmitter hereinbefore described and illustrated by the accompanying drawings.
Dated this 17th day of June 1886