Improvements in and relating to Desk Telephones,
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Desk Telephones,
We, MAX BYNG, Electrical Engineer, and FRANCIS GEORGE BELL, Electrician,
both of 69-71, Queen Victoria Street, in the City and County of London, do
hereby declare the nature of this invention to be as follows:-
Our invention relates to certain improvements in and relating to telephones
especially applicable to desks, or office furniture, and has for its object the
production of a receiver and transmitter with a multiple switch board in a compact.
form, the device being adapted for attachment in a horizontal, vertical, or angular
position, an index with reversible figures showing the communicating points or
stations in whatever position the device is fixed. The receiver and transmitter
are connected together, so as to allow of conversation on both sides.
In order that our invention may be the better understood, we have appended
the accompanying 2 sheets of drawings in which Figure 1 Sheet 1 is a front
elevation of the device, showing the combined transmitter and receiver in situ
ready for use, and the multiple switching apparatus. Figure 2 is an end elevation,
with the transmitter and receiver removed. Figures 3 and 3 are respectively
enlarged front and sectional views of the index, showing the reversibility of the
figures. Figure 4 Sheet 2 is a diagram showing the various connections.
In carrying our invention into effect we construct a box A Figures 1 and 2
Sheet 1, which carries the various connections, an audible signal, such as a buzzer
or bell, and a transformer or induction coil, within it. Outside is a bar B carry-
ing a sliding contact or switch C which may make contact with any of the
contact knobs a, a finger or like indicator D being attached to show the point
or station of communication. A hole or the like may be used to afford accurate
adjustment as shown by the drawings. An index or scale E is fixed to the case A
and this is shown on an enlarged scale and detached by Figures 3 and 4. The
figures are printed or formed upon discs 661 611 let into countersunk holes in the
bar E so that they may each be turned to suit any position of the case A, as
indicated by the various positions shown by Figure 3. Two hooks cc Figures 1
and 2 support a combined transmitter (microphone) F and receiver G when the
device is attached to the side of a desk, wall, or any article of furniture. Said
hooks are not in any way connected with the circuit, and may be replaced by
standards when the apparatus lies flat, or is attached in that position. When
the combined microphone transmitter and receiver G F are in use, a pressure
switch H establishes and maintains the requisite contacts.
Figure 4 Sheet 2 is a diagram showing the electrical connections.
m is a press button operating the distant alarm or audible signal according to
the point or station indicated by the sliding contact C and finger D, and n is a
D
077

page_text: buzzer bell or audible signal for the home instrument, and contained within the
box A The terminal Z E is zinc and earth, C carbon, M Z microphone zinc
and M C microphone carbon. The microphone is shown by F and the receiver
by G these being put into, and maintained in circuit while in use by hand
pressure on the switch H, which when depressed into the buzzer or the like
out of the line, and includes the receiver G and transmitter F through the primary
and secondary coils of the induction coil or transformer. The connections are
sufficiently detailed to be quite clear when the diagram is followed.
The essential features of our said invention are in the combination of a multiple
switch board with a combined transmitter and receiver, the whole apparatus
being enclosed within a small compass and being adapted for fixing or standing
upon any table, desk, or office furniture, or the wall, mantlepiece, or the like of
an office or appartment, without material alteration of the index scale or other
details.
05th. 1
T 1
1000
Dated this 05411
day of July
1000
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicants.
We, Max BYNG, Electrical Engineer, and FRANCIS GEORGE BELL, Electrician.
both of 69-71-88, Queen Victoria Street, in the City and County of London,
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:.
-
Our invention relates to certain improvements in and relating to telephones
especially applicable to desks, or office furniture, and has for its object the
production of a receiver and transmitter with a switch board in a compact
form, the device being adapted for attachment in a horizontal, vertical, or angular
position, an index with reversible figures showing the communicating points or
stations in whatever position the device is fixed. The receiver and transmitter
are connected together, so as to allow of conversation on both sides.
In order that our invention may be the better understood we have appended to
our Provisional Specification the accompanying 2 sheets of drawings in which
Figure 1 Sheet 1 is a front elevation of the device, showing the combined tran-
mitter and receiver in situ ready for use, and the switching apparatus. Figure 2
is an end elevation, with the transmitter and receiver removed. Figures 3 and 3ª
are respectively enlarged front and sectional views of the index, showing the
reversibility of the figures. Figure 4 Sheet 2 is a diagram showing the various
connections. To our Complete Specification we have appended a sheet of draw-
ings in which Figure 5 is a plan view, and Figure 6 a sectional view of a
modification of the indicating device.
-
In carrying our invention into effect we construct a box A Figures 1 and 2
Sheet 1, which carries the various connections, an audible signal, such as a buzzer
or bell, and a transformer or induction coil, within it. Outside is a bar B carry-
ing a sliding contact or switch C which may make contact with any of the
contact knols a, a finger or like indicator D being attached to show the point
or station of communication. A hole or the like may be used to afford accurate

page_text: adjustment as shown by the drawings. An index or scale E is fixed to the case A
and this is shown on an enlarged scale and detached by Figures 3 and 4. The
figures are printed or formed upon discs bb1611 let into countersunk holes in the
bar E so that they may each be adjusted to suit any position of the case A, as
indicated by the various positions shown by Figure 3. Two hooks cc Figures 1
and 2 support a combined transmitter (microphone) F and receiver G when the
device is attached to the side of a desk, wall, or any article of furniture. Said
hooks are not in any way connected with the circuit, and may be replaced by
standards when the apparatus lies flat, or is attached in that position. When
the combined microphone transmitter and receiver G F are in use, a pressure
switch H establishes and maintains the requisite contacts.
Figure 4 Sheet 2 is a diagram showing the electrical connections.
m is a press button operating the distant alarm or audible signal according to
the point or station indicated by the sliding contact C and finger D, and n is a
buzzer, bell, or audible signal for the home instrument, and contained within the
box A. The terminal Z E is zinc and earth, C carbon, M Z microphone zinc
and M C microphone carbon. The microphone is shown by F and the receiver
by G these being put into, and maintained in circuit while in use by hand
pressure on the switch H, which when depressed into the buzzer or the like n
out of the line, and includes the receiver G and transmitter F through the primary
and secondary coils of the induction coil or transformer. The connections are
sufficiently detailed to be quite clear when the diagram is followed.
Figure 5, in the drawing appended to our Complete Specification is a plan view
showing the arrangement of the index when the apparatus is used under the edge
of a desk or table, and Figure 6 shows the same in section. Instead of using
the bar B as herein before described we arrange the contact knobs a circumferen-
tially to the axis of a moveable barrel m and switch arm C said barrel being
mounted upon a stud or fixed spindle and moved by a milled head o or like
device. A disc p fixed upon the barrel m or forming an integral part thereof,
carries the respective numbers of the contacts, which are visible through a hole
in a fixed tuber attached to the base of the instrument. The numbers being
moved by the rotation of the barrel m and disc » correspond exactly to the contact
knobs a and the connections established therewith by the arm C.
The essential features of our said invention are in the combination of a
switch board with a combined transmitter and receiver, the whole apparatus
being enclosed within a small compass and being adapted for fixing or standing
upon any table, desk, or office furniture, or the wall, mantlepiece, or the like of
an office or apartment, without material alteration of the index scale or other
details.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is;
First. The combination of a telephone switch board with a combined transmitter
and receiver and index, adapted to horizontal, vertical or angular adjustment,
substantially as herein described and shown by the appended drawings.
Second. In desk or adjustable telephones the method of and means for arranging
the index figures, substantially as herein described, in combination with a switch
boadd, transmitter and receiver, substantially as herein described and shown
by the appended drawings.
Third. In desk or adjustable telephones, the method of and means for estab-
lishing the various circuits by a moveable contact, substantially as and for the
purposes herein described and shown by the appended drawings.
Fourth. In desk or adjustable telephones the system of electrical connections
substantially as and for the purposes herein described with especial-reference to
Figure 4 of the drawings.
Fifth. In desk or adjustable telephones the arrangement of contact kunha in

page_text: semi-circular form, with a rotating contact arm, and circular index substantially
as herein described with especial reference to Figures 5 and 6 of the appended
drawings.
Dated this 28th day of September 1898.
FREDK. WALKER,
73, St. Stephen's Road, Upton Park, London, E.,
Agent for the Applicants.