IMPROVEMENTS IN CLOCKS AND TIMEPIECES FOR INDICATING THE TWO SYSTEMS OF CALCULATING TIME ON TWO DIALS EITHER IN THE SAME PLANE OR AT ANGLES TO EACH OTHER BY THE SAME MOVEMENT
Year: 1885

page_text: We JAMES KENDAL of 106 Cheapside in the City of London Watch and Clock
Manufacturer and MARC LAVAL of 110 Cannon Street in the City of London
Commission Agent do hereby declare the nature of an invention for IMPROVEMENTS
IN CLOCKS AND TIMEPIECES FOR INDICATING THE TWO SYSTEMS OF CALCULATING
TIME ON TWO DIALS EITHER IN THE SAME PLANE OR AT ANGLES TO EACH OTHER
BY THE SAME MOVEMENT to be as follows:-
The clock or timepiece has two dials in the same plane or at angles to each other
one dial to show 12 hours and the other dial 24 hours each pair of hands being
worked from the same movement.
To carry our invention into effect when the dials are in the same plane we place
upon the centre arbor of the movement of an ordinary timepiece a bevil wheel
gearing into another wheel on a shaft with a bevil wheel gearing into a bevil wheel
fixed on the arbor of the minute wheel of the motion work of the 24 hour clock
dial, the proportions between the minute wheel pinion and the hour wheel being
of course 24 to 1. It is obvious that the movement may be placed behind
the 24 hour dial and the 12 hour dial worked by suitable gearing from the
movement.
When the dials are placed at an angle it is intended to drive the 24 hour
motion from the centre wheel which gears into a spur wheel carried on an arbor
which has a bevil wheel on its other end gearing into a bevil wheel on the end
of the cannon pinion, arbor which drives the 24 hour motion as previously
described.
ALL
TI
A. LESLIE ANSTELL,
1, Gresham Buildings, Basinghall Street,
Agent for the said James Kendal and Marc Laval,

page_text: We JAMES KENDAL of 100 Cheapside in the City of London Watch and Clock
Manufacturer and MARC LAVAL of 110 Cannon Street in the City of London
Commission Agent do hereby declare the nature of an invention for IMPROVEMENTS
IN CLOCKS AND TIMEPIECES FOR INDICATING THE TWO SYSTEMS OF CALCULATING
TIME ON TWO DIALS EITHER IN THE SAME PLANE OR AT ANGLES TO EACH OTHER
BY THE SAME MOVEMENT, and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement, reference
being had to the drawings hereunto annexed and 'to the figures and letters marked
thereon that is to say:-
The clock or timepiece has two dials either in the same plane or at angles to each 1
other. One of these dials has the hour circle divided into twelve which the hour
hand traverses once in twelve hours in the usual way The hour circle of the other
dial is divided into 24 and the hour hand of this dial makes one revolution in
24 hours. Each pair of hands is worked by the same movement.
Figure 1. is a view of the mechanism for actuating the hands of a clock with the
dials placed in the same plane.
Figure 2 is a view of the dials of the same clock as placed in the same plane.
Figure 3 is a view of the mechanism for actuating the hands of a clock with the
dials placed at angles to each other.
Figure 4 is a view of the dials of the same clock as placed at angles to each
other.
For actuating the hands on the two dials of either form of clock we employ the
movement of an ordinary time piece placed behind either the 12 hour dial or the
24 hour dial. In the drawings this movement is placed behind the 12 hour dial
and is worked in the ordinary way.
The following parts of such movement are the same as are usually employed and
apply both to the clock with dials on the same plane and to that with the dials at
angles to each other and are shown in Figures 1 and 3 that is to say. A the
harrell B the great wheel C great wheel pinion E. centre wheel H. cannon pinion
I minute wheel K minute wheel pinion L hour wheel T. centre arbor. To carry
our invention into effect when the dials are in the same plane (see Figure 1) we
place upon the centre arbor (T) of the ordinary movement (before mentioned)
a bevil wheel (F) gearing into another bevil wheel (G) fixed on one end of a
shaft (N) on the other end of which is another bevil wheel (M) gearing into a bevil
wheel (0) fixed on the arbor of the minute wheel (P) of the 24 hour dial motion
work the other parts of which are the minute wheel pinion (Q) the cannon
pinion (R) and the hour wheel (S) the proportions between the minute wheel
pinion (Q) and the hour wheel (S) are 24 to 1 and thus the hour hand on the
24 hour dial makes one revolution while the hour hand of the 12 hour dial
makes two.

page_text: When the dials are placed at an angle to each other as in figure 4 a similar
system to the above may be employed with the addition of an extra shaft with
bevil wheels but we prefer in such case to drive the 24 hour motion as shown in
Figure 3. In this case the centre wheel E of the movement behind the 12 hour
dial gears into a spur wheel X carried on an arbor (V) which has a bevil wheel M on
its other end gearing into a bevil wheel (O) on the end of the cannon pinion
arbor (Y) which drives the 24 hour motion work as previously described. This
system may also be applied to the clock with dials on the same plane but in such
case we prefer the system shown in Figure 1. It is obvious that in either case the
movement may be placed behind the 24 hour dial, and the 12 hour dial worked by
suitable gearing from such movement. The dials are of the ordinary description
the one divided into 12 hours and the other into 24 hours and when placed in the
same plane may be side by side as in Figure 2 or the one above the other If placed
at angles to each other (figures 3 and 4) it is most convenient for the dials to be at
right angles to each other but if required they can be placed at any other angle the
position of the bevil wheels in the movement being varied accordingly.
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
1. The combination of a 12 hour dial and a 24 hour dial placed on the same
plane or at angles to each other their respective hour hands being arranged to
make one revolution in 12 hours and the other a revolution in 24 hours substantially
as herein described.
2. The combination of a 12 hour dial and a 24 hour dial placed as aforesaid and
having their hands on both dials worked by one movement by means either of a
bevil wheel (F) fixed upon the centre arbor (T) the shaft (N) with the two bevil
wheels (G. & M.) and the bevil wheel (O) fixed on the arbor of the 24 hour dial
motion work or by means of a spur wheel (E) an arbor (V) with two bevil
wheels (X&M) and the bevil wheel (O) fixed on the end of the cannon pinion
arbor of the 24 hour motion work substantially as herein described and for the
purposes stated.