Improvements in the Means and Apparatus for Making Needle Speaking Telegraph Instruments Semi-acoustic.
Year: 1886

page_text: Date of Application, 26th June, 1886.
Complete Left, 11th Mar., 1887.
Complete Accepted, 15th Apr., 1887.
Improvements in the Means and Apparatus for Making Needle
Speaking Telegraph Instruments Semi-acoustic.
I, EDWARD DUNN, of 22, Talbot Road, Farcbridge, Stafford, Telegraph Inspector
of the London and North Western Railway Company do hereby declare the nature of
this invention to be as follows :-
My invention consists of an improvement in the means and apparatus at present
employed for making needle speaking Telegraph Instruments semi-acoustic.
For this purpose I employ an improved form of needle, together with an improved
form of sounder.
The sounder as at present made by me consists of two boxes of wood, upon one, or
both, sides of which is fixed a small plate or stud of ivory. Upon the needle, as
usually made and used hitherto, I solder, or otherwise fasten, a short pin, or bar, in
such a position that it will strike endwise upon the aforesaid small plate or stud
of ivory.

page_text: Speaking Telegraph Instruments Semi-acoustic.
I, EDWARD DUNN of 23 Ingestre Road, Farebridge, Stafford, Telegraph Inspector
of the London and North Western Railway Company 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:-
My Invention consists of improvements in the means and apparatus at present
employed for making needle speaking Telegraph Instruments semi-acoustic.
For this purpose I employ an improved form of needle together with improved
forms of sounders.
In order to explain my Invention more in detail I have appended one sheet of
drawings, in which Fig. 1 represents the dial or face of the Instrument, with one pair
of one form of sounder in position. Figs. 2 and 3 represent other forms of sounders.
Across the needle N as usually made and used hitherto, and about midway between
the centre and end, I solder, or otherwise fasten, a short pin or bar P Fig. 1, so that
by the movements of the needle it shall strike endwise upon the sounders hereinafter
described The sounders as made by me consist of, Fig. 1, two boxes B B of wood,
mica, or similar material upon one side of each of which is fixed a small plate or
stud S of glass, ivory, or other hard and preferably non-conducting material, the
boxes being fixed to the dial or face of the Instrument by means of small pieces of
brass of the form shewn at L, and the small screws which hold the needle pivot centre-
block to the face of the Instrument, so that the small plate or stud S shall receive the
beat, or impact, of the hereinbefore described pin or bar P.
Another form of sounder, Fig. 2, consists of two strips A of bell metal, glass, or
porcelain, each supported on two transverse threads B upon, or enclosed in, suitable
frames C preferably of wood, and attached to the dial or face of the Instrument by
means of lips L of metal, and the aforesaid small screws, so that by the movements of
the needle the herein before described pin or bar P will strike endwise upon the face
of the strips at or near the centre.
Another form of sounder, Fig. 3, consists of two cups A of thin brass, iron, steel,
porcelain, or wood, at the apex of each of which is fixed a small plate or stud of glass,
ivory or other hard and preferably non-conducting material, and fixed to the dial or
face of the Instrument by means of the lip L of each cup and the aforesaid small
screws, so that by the movements of the needle the small plate or stud B shall receive
the beat or impact of the herein before described pin or bar P.

page_text: 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 :-
1. An improved form of needle for use with needle speaking Telegraph Instruments
as herein set forth.
2. Improved forms of sounders, for use with needle speaking Telegraph Instruments
as herein set forth.
3. The combination of an improved form of needle with improved forms of sounders
for use with needle speaking Telegraph Instruments substantially as described.
EDWARD DUNN.