IMPROVEMENTS IN AND RELATING TO DIALS FOR WATCHES, CLOCKS OR CHRONOMETERS, SO AS TO MAKE THEM APPLICABLE TO THE NEW SYSTEM OF TIME NOTATION to
Year: 1884

page_text: PROVISIONAL SPECIFICATION,
I, ARTHUR FRANK HEWITT of 11 Redcross Street Liverpool, in the County of
Lancaster, Iron Merchant do hereby declare the nature of my said invention
for IMPROVEMENTS IN AND RELATING TO DIALS FOR WATCHES, CLOCKS OR
CHRONOMETERS, SO AS TO MAKE THEM APPLICABLE TO THE NEW SYSTEM OF TIME
NOTATION to be as follows :—
This invention has for its object a dial, which will alternately show the numbers
up to twelve and from thirteen to twenty four, so that the same dial with only
twelve places for numbers shall show the entire twenty four hours.
The invention consists: in forming a dial with twelve transparent spaces or holes
in the part where the figure should be and with opaque matter between these
spaces or holes, and in placing a dial with the numbers up to twelve below it,
spaced in the usual manner and having the numbers thirteen to twenty-four spaced
between them, thirteen following or immediately preceding one and so on.
The
clock or watch has then a tappet, cam or other convenient mechanism actuated by
the hour hand arbor in such manner that whenever the hour hand reaches the top
of the clock, the dial carrying the figures is changed from the position showing one
to twelve to the position showing thirteen to twenty four or vice versa.
This arrangement will not interfere with illuminating of clocks, as all but the
part immediately between the figure holes can be illuminated.
WP: THOMPSON & Co.,
Of 6, Lord Street, Liverpool, and
323, High Holborn, London,
Patent Agents for the Applicant.

page_text: I, ARTHUR FRANK HEWITT, of 11 Redcross Street, Liverpool, in the County of
Lancaster, Iron Merchant, do hereby declare the nature of my said invention
for "IMPROVEMENTS IN AND RELATING TO DIALS FOR WATCHES, CLOCKS, OR
CHRONOMETERS SO AS TO MAKE THEM APPLICABLE TO THE NEW SYSTEM OF TIME
NOTATION" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention has for its object a dial which will alternately show the numbers
up to twelve and from thirteen to twenty four, so that the same dial with only
twelve places for numbers shall show the entire twenty four hours.
This invention is best described by aid of the accompanying drawings in which
Figure 1 shows the stationary perforated dial
Figure 2 the movable figured dial beneath it.
Figure 3 the tappet and cam apparatus for moving said dial.
In Figure 1, I have shown round perforations, these can however be of any
desired shape, or instead of being perforations can simply be transparent portions
of an otherwise opaque disc.
In Figure 2 I have shown the figuring as I prefer it, it can however be either
entirely Arabic or entirely Roman or a mixture of the two, say 1-12 Roman
and 13-24 Arabic.
The apparatus of moving the disc Figure 2 is set forth in Figure 3.
A is a cam geared to the hour hand by gearing as shown in dotted lines, so
that the cam shall make but one revolution for two of the hour hand-this is done
by making the two gear wheels with respective teeth numbering as 1 to 2.
B B' are two tappets on spring supports CC respectively. Each of these tappets
has a pin D D¹ engaging with a hole or slot E E¹ in the dial Figure 2. F is a third
tappet in spring support G having a pin H working on the V edges of hole I in
dial Figure 2. The cam or snail A revolving alternately pushes out and allows to
fall back the tappets B B¹ and pins D D'. Thus, in the drawing, tappet B and
pin D have just fallen back, moving the dial so as to show the Figures 13 to 24;
the cam twelve hours afterwards arrives with its point opposite pin D₁ and
continuing its travel at 24 o'clock releases this pin, which falling back changes
the disc Figure 2, so as to show the figures 1 to 12 behind the openings in disc
Figure 2.
-
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
1st. The combination of a disc or annulus having thereon the numbers from
1 to 12 alternating with those from thirteen to twenty four inclusive, and a second

page_text: disc above it having transparent places or vacancies so arranged that every
alternate number on the aforesaid disc or annulus can be seen through it, while the
remaining numbers remain hid by the 2nd disc in combination with mechanism
for changing the relative positions of the two discs so that each set is alternately
uncovered for the purposes described.
2nd. The mechanism for changing the relative positions of the discs every twelve
hours, substantially as described.