IMPROVEMENTS IN SPEAKING TUBES
Year: 1888

page_text: Date of Application, 13th Jan., 1888
Complete Specification Left, 15th Oct., 1888
Complete Specification Accepted, 16th Nov., 1888
I FRANK MOORE of 3 Glenhurst Road Brentford Middlesex, Engineer, do hereby
declare the nature of my said invention for "IMPROVEMENTS IN SPEAKING TUBES to be
as follows:
This invention relates to Improvements in speaking, tubes by means of which the
inconveniences hitherto arising by reason of the signal whistle not being in its proper
place are obviated.
According to this invention 1 provide a whistle within the speaking tube itself
preferably close to the mouth-piece or in the neck thereof. The whistle is so arranged
that it will sound when a current of air is blown or otherwise driven through the tube
from the end opposite to that where the whistle is fixed. In conjunction with the whistle
a signal pin may be inserted, and it may be combined with the whistle so that the signal-
pin or stud may indicate which whistle has been blown when several speaking tubes
are fixed side by side.
It will be obvious that there may be a whistle at each end of the speaking tube.
I do not confine myself to any particular construction of whistle as a great variety
of ways may be adopted to carry my invention into effect. A convenient way however
is to place a disc across the passage in the speaking tube and in this disc a hole is made
which leads the air to the "lip" of the whistle which is provided at the side of the tube.
In that case the signal pin may work in the centre of the disc. A second disc confines
the air on the other side of the whistle.
BERNHARD DUKES,.
226, High Holborn, London, W.C.,
Agent for the Applicant.

page_text: I, FRANK MOORE of 3 Glenhurst Road, Brentford in the county of Middlesex,
Engineer, do hereby declare the nature of my said invention for "IMPROVEMENTS IN
SPEAKING TUBES" 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 improvements in speaking tubes by means of which the
inconveniences hitherto arising by reason of the signal whistle not being in its proper
place are obviated.
According to this invention I provide a whistle within, the speaking tube itself
preferably close to the mouth piece or in the neck thereof. The whistle is so arranged
that it will sound when a current of air is blown or otherwise driven through the tube
from the end opposite to that where the whistle is fixed. In conjunction with the
whistle a signal pin may also be inserted or it may be combined with the whistle so
that the signal-pin or stud may indicate which whistle has been blown when several
speaking tubes are fixed side by side.
It will be obvious that there may be a whistle at each end of the speaking tube.
I do not confine myself to any particular construction of whistle as a great variety
of ways may be adopied to carry my invention to effect. A convenient way however
is to place a disc across the passage in the speaking tube and in this disc a hole is
made which leads the air to the lip of the whistle which is provided at the side of
the tube.
In that case the signal pin may work in the centre of the disc. A second disc
confines the air on the other side of the whistle.
One way of carrying this invention into practice is shown in the accompanying
drawing which is a section of that part of the speaking tube which embodies my
invention.
A is the body of the speaking tube at a the flexible or other pipe connecting the
same with the distant locality is attached. B is a centre-piece dividing the interior of
the speaking tube into two portions. C is the signal pin the top c¹ whereof is seen in
the mouthpiece D when the whistle has been blown (this position being shown in
dotted lines) whilst the bottom part carries a disc c² partly in order to give increased
inpact to the air partly better to direct the air to the lip of the whistle E. The
mouthpiece D is of the usual funnel shape. The flange e³ limits the movement of
pin C.
When the speaking tube is not in use and suspended in the usual way the pin C is
in the position shown in full lines. When the speaking tube is blown into at the

page_text: distant end the air impinges upon the disc c and the pin Cassumes the position shown
in dotted lines. Travelling in the direction of the arrows it reaches the lip b and
the whistle is blown. When the tube is raised the pin resumes its former position and
the sound travels in the direction of the arrows 2.
Having now particularly described and ascertained the nature of my said invention
& in what manner the same is to be performed I declare that I claim,
A speaking tube with which a whistle is embodied substantially as set forth.