A New or Improved Combined Transmitting and Receiving Sounder Telegraph Instrument.
Year: 1891

page_text: Date of Application, 30th Apr., 1891
Complete Specification Left, 29th Jan., 1892-Accepted, 5th Mar., 1892
PROVISIONAL SPECIFICATION.
A New or Improved Combined Transmitting and Receiving Sounder
Telegraph Instrument.
We THOMAS ADOLPHUS BULLOCK, of No. 11 Old Broad Street, in the City
of London, Superintendent of Telegraphs, and ALFRED CHARLES BROWN, of
No. 50 Old Broad Street, aforesaid, Electrician, do hereby declare the nature of
this invention to be as follows:-
This invention has reference to an instrument, which we propose to call a
"unigraph," designed to constitute a complete transmitting and receiving sounder
telegraph apparatus. The instrument, which is small and compact, is portable and
specially fitted for transport or military use.
As compared with "sounder" instruments at present in use, this invention has
several novel features, in addition to its compactness and portability, for the
purpose of increasing its simplicity, reducing the chance of faults to a minimum,
and rendering it exceedingly sensitive so as to obtain a clear, sharp, and readable
sound for a very small current.
The instrument is preferably circular in shape being conveniently formed of a
small tubular or slightly conical shaped metal casting, or an ebonite or other case
may be employed. To the lower extremity of this case a suitable metallic plate is
secured which if made of iron (as we generally prefer) may form at once the base
of the instrument itself and the back-iron or crown of an electromagnet the poles of
which may be screwed or rivetted directly into it and project upward inside the
case. At the top of the case, and in close proximity to the poles of the electro-
magnet hereinbefore referred to, is a rocking diaphragm, in place of an ordinary
armature, which forms one of the special features of our invention. This portion,
instead of merely being a solid bar such as is usually employed, is a hollow
sound-box completely covering the top of the case and protecting the vital parts
beneath. It may be composed of two discs held apart by a rim, or it may be
formed of two concave shaped stampings or one such stamping and a plain disc
fastened together at their rims, or it may be otherwise suitably made the essential
feature in its construction being that it shall form a shallow closed chamber. The
sound-box or diaphragm so constructed is pivotted in the case, preferably somewhat
out of its centre line, so as to rock in a vertical plane and is normally held away
from the poles of the electromagnet by a spring or other means. Metal or other
studs limit the rocking motion of the diaphragm and serve to sound it each time it
is oscillated under the combined action of the electromagnet and spring. We find
that an armature so constructed gives an exceptionally loud and clear sound for a
given small current and its lightness and consequent readiness to respond to the
current impulses permits of very rapid working.
The operating key is suitably pivotted inside the case and is carried out through
a slot in such case a sufficient distance to carry the operating button. Electrical
contact-blocks are fixed by insulating attachments on the case at the upper and
lower extremities of the slot through which the key passes. Normally the key is
held against the upper contact by a spring or other means. On the side of the
case opposite to the slot through which the key passes, the line, earth, and copper
terminals are attached.
201
+1 1001

page_text: COMPLETE SPECIFICATION.
A New or Improved Combined Transmitting and Receiving Sounder
Telegraph Instrument.
We, THOMAS ADOLPHUS BULLOCK, of No. 11, Old Broad Street, in the City
of London, Superintendent of Telegraphs, and ALFRED CHARLES BROWN, of
No. 50, Old Broad Street, aforesaid, 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 :-
"
"3
This invention has reference to an instrument which we call a unigraph
designed to constitute a complete transmitting and receiving sounder telegraph
apparatus. The instrument, which is small, compact and portable, is specially
suited for transport or military use, and for other purposes where minute pro-
portions and portability, coupled with reliability and effectiveness, are desired.
As compared with existing sounder instruments, this invention has several novel
features which intensify its simplicity and reduce the chance of faults or disorder to
a minimum, while its extreme sensitiveness renders a clear, ringing, and unusually
readable sound obtainable, with a very small current.
The annexed drawing, to which reference is hereinafter made, gives a perspective
view of an apparatus made according to our invention with a portion of the case
broken away, and the portion, D, removed from its position on the top of the
instrument.
The instrument is preferably circular in plan being conveniently formed of a
small tubular or slightly conical shaped metal casting, A, or an ebonite or other
case may be employed. To the lower extremity of this case a suitable plate, B, is
secured, which, if made of iron, (as we generally prefer) may form at once the base
of the instrument itself and the back-iron or crown of an electro-magnet the
poles, P, of which may be secured or rivetted directly into it and project upward
inside the case as shown. At the top of the case, and in close proximity to the
poles of the electro-magnet hereinbefore referred to, is a rocking diaphragm, D, in
place of an ordinary armature, which forms one of the special features of our
invention. This portion, instead of merely being a solid bar, such as is usually
employed, is a hollow sound-box completely covering the top of the case and
protecting the vital parts beneath. We find it preferable to construct this of two
discs, a, and, b, of thin metal held apart by a rim, c, to which they are secured;
but we do not wish to limit ourselves to this manner of construction. It may be
formed of two concave shaped stampings, or one such stamping and a plain disc
fastened together at their rims, or it may be otherwise suitably made the essential
feature in its construction being that it shall form a shallow closed chamber. The
sound-box or diaphragm so constructed is pivotted in the case as shown at the
points, d, and, e, preferably somewhat out of its centre line, so as to rock in a
vertical plane and is normally held away from the poles of the electromagnet by a
spring, F, or other suitable means. Metal or other studs, f, and, g, limit the
rocking motion of the diaphragm and serve to sound it each time it is oscillated
under the combined action of the electromagnet and spring. We find that an
armature so constructed gives an exceptionally loud and clear sound for a given
small current and its lightness and consequent readiness to respond to the current
impulses permits of very rapid working.
The operating key, K, is secured to, or forms part of, the cross-bar, S, the ends
of which are pivotted inside the case at two opposite points, one of such points
being shown in the drawing at, h. The key is carried out through a slot in the
case, as shown, a sufficient distance to carry the operating button, H. Electrical
contact-blocks, M, and, N, are fixed by insulating attachments on the case at the
upper and lower extremities of the slot through which the key passes. Normally,
the key is held against the upper contact by a spring or other means not visible in

page_text: the drawing. On the side of the case opposite to the slot through which the key
passes, the line, earth, and copper terminals L, E, and C, respectively are
attached.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. In a telegraphic receiving instrument of the "sounder" type an armature or
rocking diaphragm consisting of a hollow sound-box or shallow closed chamber
substantially as herein set forth.
2. In conjunction with the armature or rocking diaphragm referred to in the
preceding claim, the combination and arrangement of parts constituting our new or
improved combined transmitting and receiving sounder telegraph instrument sub-
stantially as herein set forth and illustrated in the annexed drawing.
11
ليوم
1
1000
A. F. SPOONER,
124, Chancery Lane, W.C., Agent for the Applicants.