Improvements in or connected with Speaking Tubes.
Year: 1889

page_text: Date of Application, 11th Feb., 1889
Complete Specification Left, 11th Nov., 1889-Accepted. 14th Dec.. 1889
PROVISIONAL SPECIFICATION.
Improvements in or connected with Speaking Tubes.
HENRY GARRARD, Ostrich Feather Dyer 22 Red Lion Street, Clerkenwell E.C.
and CHARLES CLARKE Engineer of 31 Herbert Street Hoxton N. do hereby declaro
the nature of this invention to be as follows :-
A Whistle, Indicator, and Mouthpiece combined & on attaching to terminals of
Speaking Tubes in any position.
To keep Whistle and Indicator automatically or mechanically constantly in
position, when not in use also to entirely deaden sound from terminal to terminal
when closed.
This is effected, both Whistle and Indicator by means of an Interior or Exterior
Spiral Spring or automatically by means of gravity.
Dated the 11th February 1880
HENRY GARRARD.
CHAS. CLARKE.
COMPLETE SPECIFICATION.
Improvements in or connected with Speaking Tubes.
We HENRY GARRARD, Ostrich Feather Dyer 22 Red Lion Street, Clerkenwell
E.C. and CHARLES CLARKE Engineer of 31 Herbert Street, Hoxton N., 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 improvements in the mouth pieces of speaking tubes the
object being to avoid the inconveniences which arise by omissions to replace the
whistle after speaking at mouth pieces provided with detachable whistles in the usual
manner.
For this purpose we provide the mouth piece and whistle and indicator represented
in the accompanying drawings in all the figures of which like reference letters
indicate the same part.
Figure 1 is a side elevation of the mouth piece and whistle partly in section.
Figure 2 is a front view of the same, and Figure 3 is a side elevation showing the
indicator which is blown up into the position shown by dotted lines simultaneously
with blowing the whistle.
Between the month piece A and the screwed connection B we provide an enlarge-
ment in which a whistle D is fitted so as to be capable of sliding down below the
air passage on depressing the button E and of returning again into the air passage by
means of the spring G when the button E is released after speaking through the
tube.
When the whistle D is in the position shown in Figure 1 the sound produced by
blowing through the whistle from the other extremity of the speaking tube escapes
from the openings HHH" which are closed by a plate K provided also for the
purpose steadying the movement of the whistle during its rise and fall under the
control of the spring button E.
Instead of employing the spring button E the enlargement C may be inverted and
the whistle may drop to the required position automatically without the assistance of
a spring and in this case may be driven upward into the enlargement C by means of a
plain button without a spring so that the whistle may be removed from the air passage
while a conversation is carried on and may drop automatically into position again
when the button is released.
Priced 1

page_text: When several such mouth pieces are employed in positions near to each other wo
provide them each with an indicator as a means of ascertaining from which mouth
piece the whistling sound cunnnated. The indicator employed for this purpose's
shown at Figure 3 in which L is a plate hinged at M resting upon a vent open
made in the upper part of the enlargement so that the current of nir produce co
sound the whistle at the same time drives the indicator plate L up to the posi on
shown in dotted lines. The light chain N serves to connect the indicator plato Lith
the whistle Dso that upon depressing the spring button E to remove the whist'e D
from the air passage for speaking purposes, the indicator plate L is replaced in its
norinal position.
Having now particularly described and ascertained the nature of our said invention
and in what manner the same is to be performed wo declare that what wo
claim is :-
1. A speaking-tube-mouth-piece having a whistle permanently fitted therein in
such a manner that it may automatically lodge in the air passage through the mouth
piece and be capable of being removed therefrom by pressure upon a button while
using the tube for speaking purposes substantially as described and illustrated by
Figures 1 and 2 of the accompanying drawings.
2. An indicator for speaking-tube-mouth-pieces consisting of a hinged plate raised
by a current of air through the speaking tube passing out by a vent hole normally
covered by the hinged plate substantially as described.
3. In a speaking-tube-month-piece with a permanent whistle arranged to be moved
away from, and to return automatically into, the air passago, the employment of a
light chain N connecting the whistle with the hinged indicator plate for returning the
indicator plate to its normal position when the whistle is removed from the air passage
to use the tube for speaking purposes substantially as described and illustrated by
Figure 3 of the accompanying drawings.
Dato this 11th day at Nawanshan 140
AYRTON & THOMAS,
Agents for the Applicants.