Improvements in or relating to Speaking Tubes.
Year: 1893

page_text: Date of Application, 12th Dec., 1893
Complete Specification Left, 11th Sept., 1894-Accepted, 13th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in or relating to Speaking Tubes.
I, HAHNEMANN ADOLPHUS CUTMORE of 18 Queen's Road, South Norwood,
in the County of Surrey, Electrician, do hereby declare the nature of this
invention to be as follows:-
This invention relates to speaking tubes preferably of the well known homacoustic
form in which separate ear and mouth pieces are employed although I wish
it understood that the invention may be applied to tubes of the ordinary
construction.
The homacoustic tubes are fitted with a cock plug or equivalent device by which
when the movable car piece is lowered the speaking tube is closed, but upon raising
the ear piece the speaking tube is opened. In applying the present invention to
the homacoustic tubes I place in any suitable position say for instance inside the
plug of the cock a reinforcing device say a tongue, deflector or similar intensifying
device projecting a convenient distance into the line of the tube say for example
about half-way, and if necessary at an angle of about 45° to the axial line of the
tube. This may be connected with the plug so as to deflect the sound into the ear
tube, but has also the effect of improving the transmission in either direction
through the tube. The tongue I prefer to make thin or with a thin connection or
fastening so that it may be capable of vibrating, and of suitable material say for
example rolled German silver capable of responding in a greater or less degree to
the vibrations due to the speaking. The exact shape, construction and application
of the tongue may vary and so long as the proper conditions are observed its
shape and the way it is fastened are unimportant, but I have obtained excellent
results by securing one end of it in the cock plug, leaving the rest of the tongue
substantially free to vibrate after the manner of, though perhaps not so freely as,
the reed of a musical instrument.
This tongue or reed may be applied wherever required in, or in connection with,
the tube or its appurtenances and any required number of tongues may be fitted.
I have previously described the fitting of it in the cock plug in the case of the
homacoustic tubes, because I find that a convenient place to put it, and have
obtained very satisfactory results with that arrangement; nevertheless I by no
means bind myself to put it in that particular position even in the homacoustic
tubes.
Dated this 12th day of December 1893.
W. P. THOMPSON & BOULT,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Speaking Tubes.
I, HAHNEMANN ADOLPHUS CUTMORE, of 18 Queen's Road, South Norwood
in the County of Surrey, 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 :-
This invention relates to speaking tubes, preferably of the well known
homacoustic form in which separate ear and mouth pieces are employed, although

page_text: I wish it to be understood that the invention may be applied to tubes of the
ordinary construction.
The homacoustic tubes are fitted with a cock plug or equivalent device by which,
when the movable ear piece is lowered the speaking tube is closed, but upon raising
the ear piece the speaking tube is opened. In applying the present invention to
the homacoustic tubes, I place in any suitable position, say for instance, inside the
plug of the cock, a reinforcing device, say a tongue, deflector, or similar intensifying
device, projecting a convenient distance into the tube, say for example about half-
way, and at an angle of about 45 degrees to the axial line of the tube. This
may be connected with the plug, so as to deflect the sound into the ear tube, but
has also the effect of improving the transmission in either direction through
the tube.
The tongue I prefer to make thin or with a thin connection or fastening so that
it may be capable of vibrating, and of suitable material, say for example rolled
German silver, or mica, capable of responding in a greater or less degree to the
vibration due to the speaking.
The exact shape, construction and application of the tongue may vary, and so
long as the proper conditions are observed, its shape and the way it is fastened are
unimportant, but I have obtained excellent results by securing one end of it in the
cock plug, leaving the rest of the tongue substantially free to vibrate, after the
manner of, though perhaps not so freely as, the reed of a musical instrument.
This tongue or reed may be applied wherever required in, or in connection with
the tube or its appurtenances and any required number of tongues may be fitted
say for instance, where the tubing connecting with the homacoustic instruments
hereinbefore mentioned, is about 300 feet in length, I have found it advantageous
to place the tongues where any severe bends occur.
I have previously described the fitting of it in the cock plug, in the case of the
homacoustic tubes, because I find that, a convenient place to put it, and have
obtained very satisfactory results with that arrangement, nevertheless, I by no
means bind myself to put it in that particular position even in the homacoustic
tubes.
Figure 1, in the accompanying drawings is a sectional view of the mouth piece
and plug of a homacoustic instrument shewing the position of the tongue when only
one ear piece is used,
Figure 2, shews a separate view of the tongue, whilst
Figure 3 illustrates the position of two tongues in a plug when two ear pieces
are employed, and
Figure 4 shews the tongues fitted in a bend, in a portion of tubing.
The tongue is lettered (A) in each view, (B) is the plug, (C) is the month-piece,
(D) is the branch leading to the ear piece, and (E) connects with the main tubing.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;-
Firstly. An intensifying device in speaking tubes, consisting of the tongue (A).
substantially as and for the purposes herein described.
Secondly. In speaking tubes, the combination and arrangement with the plug (B)
of the tongue or tongues (A) substantially as and for the purposes herein described
and as illustrated in my drawings.
Dated the 10th day of September 1894.
W. D. ROWLINGSON,
67-69, Chancery Lane, London, W.C., Agent for Applicant.