IMPROVEMENTS IN WATCHES AND CLOCKS
Year: 1873

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LETTERS PATENT to Arthur Charles Henderson, of the Firm of A.
C. Henderson and Company, British and Foreign Patent Agents,
of No. 6, Southampton Buildings, Holborn, in the County of
Middlesex, for the Invention of "IMPROVEMENTS IN WATCHES AND
CLOCKS." A communication from abroad by Adrien Joseph Virlet
Dubreuil, residing at Ham, in the Department of Somme, France.
PROVISIONAL SPECIFICATION left by the said Arthur Charles
Henderson at the Office of the Commissioners of Patents, with
his Petition, on the 22nd August 1873.
I, ARTHUR CHARLES HENDERSON, of the Firm of A. C. Henderson
and Company, British and Foreign Patent Agents, of No. 6, South-
ampton Buildings, Holborn, in the County of Middlesex, do hereby
declare the nature of the said Invention of "IMPROVEMENTS IN WATCHES
AND CLOCKS," a communication to me from abroad by Adrien Joseph

page_text: Virlet Dubreuil, a person resident at Ham, in the Department of Somme,
France, to be as follows:-
This Invention consists in adapting to watches, clocks, and other
timekeepers a movable dial, receiving motion from the shaft of the hour
The
hand, the latter being removed and the dial substituted therefor.
object of the dial is to give the hour at different parts of the globe as
compared with that of London or other city, by the passage of the
meridians, which are marked on the dial in lines, cach of which
represents a foreign country.
This dial is adjusted in a circular aperture made in the clock or watch
face, and in which it turns freely.
The minute hand remains undisturbed in its ordinary functions,
neither is the mechanism in any way changed, but the small or hour
hand is removed, and it is simulated or engraved on the movable dial in
black or other colour for showing the London time; all the other lines or
indexes bear the names of places, thus giving the corresponding time
with London or other city.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Arthur Charles Henderson in the Great Seal Patent
Office on the 20th February 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ARTHUR
CHARLES HENDERSON, of the Firm of A. C.-Henderson and Company,
British and Foreign Patent Agents, of No. 6, Southampton Buildings,
Holborn, in the County of Middlesex, send greeting.
• WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of August, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Arthur Charles Henderson,
Her special licence that I, the said Arthur Charles Henderson, my
executors, administrators, and assigns, or such others as I, the said
Arthur Charles Henderson, my executors; administrators, and assigns,
should at any time agree with, and no others, from time to time and at

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all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN WATCHES AND CLOCKS,"
¡ a communication to me from abroad by Adrien Joseph Virlet Dubreuil,
a person resident at Ham, in the Department of Somme, France,
upon the condition (amongst others), that I, the said Arthur Oharles
Henderson, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed in
the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Arthur Charles Henderson, do
hereby declare the nature of my said Invention, and in what manner
tlie same is to be performed, to be particularly described and ascertained
in and by the following statement and accompanying Drawings, that is
say:
to
This Invention consists in adapting to watches, clocks, and other
▸ timekeepers a movable dial, receiving motion from the shaft of the hour
hand, the latter being removed and the dial substituted therefore. The
object of the dial is to give the hour at different parts of the globe as
compared with that of London or other city, by the passage of the
meridians, which are marked on the dial in lines, each of which
5 represents a foreign country.
As an example, the accompanying Drawings show twelve meridians,
giving the hours of the 12 geographical places marked on the dial.
Figure 1 illustrates the application of the movable dial to a clock,
and Figure 2 to a watch; Fig. 3 shows the construction of the dial,
0. which may bear as many geographical names as may be desired.
The dial is adjusted within the ordinary clock or watch face a,
turning freely in a circular aperture. The large or minute hand is not
altered nor is the mechanism of the watch or clock in any way interfered
with. The only alteration is the substitution of the movable dial 6 in
5 place of the hour hand, which latter is engraved or otherwise marked on
the dial 6 in black or other colour, vide letter ċ; for indicating the hour
at Paris, London, or other city, which is to compare with the other

page_text: places marked on the lines shown on the dial, thus giving the difference
of time for instance, when the small hand c shows that it is 1 o'C. at
Paris, it is 2 o'C. at Vienna, 3 o'C. at Smolensk (Russia), and so on.
By this it will be seen that the movable dial can be applied to all
kinds of timekeepers without any further alteration than that of the sub-
stitution of the dial for the hour or small hand c, which dial turns
by preference in a circular cavity made in the ordinary watch or clock
face.
In lieu of engraving the hour hand on the dial ban ordinary hour
hand may be mounted thereon, the advantage of which is that the hand
being movable it can be placed opposite any of the places marked on the
dial, so as to change as desired the place of comparison from Paris to
any other country.
The extreme nicety with which the places are indicated on the dial
prevents any possibility of doubt as to the correctness of the indications.
Finally. I claim the application (to timekeepers of all kinds) of a
movable dial 6 in substitution for the hour hand, which is engraved or
otherwise marked on the dial, and indicates the hour of Paris, London,
or other city, for determining the difference of time at the several places
marked on the dial; the objects of such Invention being to provide
travellers with a watch which will give them the time at their
place of birth or other city, which they can then compare with the
country in which they travel; it also forms an attractive and instructive
watch for teachers and amateurs, and may advantageously be employed
on lines of railway or on board ship.
In witness whereof, I, the said Arthur Charles Henderson, have
hereunto set my hand and seal, this Twentieth day of February,
in the year of our Lord One thousand eight hundred and seventy-
four.
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