IMPROVEMENTS IN TELEPHONIC APPARATUS
Year: 1885

page_text: I, ASTLEY PASTON PRICE of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of said Invention for "IMPROVEMENTS IN
TELEPHONIC APPARATUS" to be as follows:-
This Invention relates to the use and employment as a substitute for diaphragms
or other arrangements hitherto employed for telephonic purposes of an apparatus
or chamber hermetically closed in which an entire or partial vacuum has been
produced and upon the surface of this apparatus or chamber the undulations or
vibrations of the atmosphere due to sound are made to impinge and act upon the
surface of the apparatus or chamber before mentioned the effects of such action
being communicated along the line to the receiver by the ordinary means or
methods as is well understood.
J. HENRY JOHNSON,
47, Lincoln's Inn Fields,
Agent for the said A. P. Price.
I ASTLEY PASTON PRICE of 47 Lincoln's Inn Fields in the County of Middlesex
Gentleman do hereby declare the nature of this invention and in what manner the
20 same is to be performed, to be particularly described and ascertained in and by the
following statement :-
This Invention relates to the use as a substitute for or addition to diaphragms
or other arrangements hitherto emploved for transmitting sound in telanhonas'
This Invention relates to the use as a substitute for or addition to diaphragms
or other arrangements hitherto employed for transmitting sound in telephones
D

page_text: of an apparatus or chamber hermetically closed in which an entire or partial
vacuum has been produced, and upon the surface of this apparatus or chamber or
upon the diaphragin forming a part thereof the undulations or vibrations of the
atmospher due to sound are made to impinge and act upon the surface of the
apparatus or chamber or the diaphragm as the case may be the effects of such
action being communicated along the line to the receiver by the ordinary means or
methods as is well understood.
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 of the accompanying drawings illustrates the application of my Inven-
tion to a magneto electric telephone-The casing A contains the diaphragm B and
projecting into the space C are the pole pieces of the magnet D. In front of the
diaphragm B is the orifice at which the air waves enter to operate the diaphragm C.
In the space C a vacuum or partial vacuum is created by a mercurial air pump or
any other suitable means for obtaining vacua Thus the diaphragm has not the
pressure of the atmosphere to contend against on one side and consequently its
vibrations are much facilitated and its action is much improved-Figure 2 shews
the simplest form of its application to a microphonic transmitter-Here the vacuum
or partial vacuum is created in the box in which are the microphonic contacts ab
which may be of the ordinary kind used in microphonic transmitters-Figures 3
and 4 are views of similar transmitters of the microphonic class and in these as
in the other Figures the space, box, or chamber from which air is exhausted is
marked C. In figure 3 the contacts are inside the said space and in Figure 4 they
are outside the said space. Like parts are marked with like letters of reference in
all the figures.
Figure 5 represents a receiving instrument, from the space C at the rear of the
diaphragm the air is exhausted as hereinbefore described.
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. In telephonic instruments a vacuum or partial vacuum created in a
chamber forming part of the instrument substantially as herein before described.
Second. The several arrangements of telephonic instruments as herein before
explained with reference to the several Figures of the accompanying drawings.
Dated 8th dess of October 1885