IMPROVEMENTS IN APPLICABLE TO WATCHES, CLOCKS AND OTHER TIME KEEPERS
Year: 1885

page_text: OR
We, JAMES KENDAL, (trading as Kendal and Dent,), Jeweller, of 100, Cheapside,
and MARC LAVAL, Merchant, of 110, Cannon Street, both in the City of London,
do hereby declare the nature of our Invention for "IMPROVEMENTS IN
APPLICABLE TO WATCHES, CLOCKS AND OTHER TIME KEEPERS," and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :—
This invention relates to certain improvements in or applicable to watches,
clocks and other time keepers in which the time is indicated by index hands or
pointers on graduated and marked or numbered dials.
The special object of the present improvements is to render watches and other
timo keepers of the kind or class herein before mentioned (and hereinafter referred
to under the general designation of "time keepers ") capable of indicating time
according to both the new system of indicating time from a common meridian in a
succession of hours from midnight to midnight, and cousecutively numbered from 1
to 24, and the system hitherto in general use of indicating time from midnight to
noon, and from noon to midnight, by following series of hours, each consecutively
numbered from 1 to 12;-a special feature of advantage being, that during the
period of transition, while both systems of time are in use, there will be no
liability of confusion arising owing to the change in number or designation of the
series of hours from noon to midnight, as the improved time keeper during such
series of hours, will, by a main pointer indicate the time according to the new
system, and, by an opposite extension thereof, will also indicate the time by which
the same hour is at present known.
To this end the Invention consists in applying to time keepers a dial which is
divided in one circle to indicate the 24 hours from midnight to midnight, and is
consecutively numbered from 1 to 24, in combination with a duplex indicator
caused to traverse one complete revolution around the dial in every 24 hours, such
duplex indicator being formed with a main pointer intended for indicating the
time according to the new system from 1 to 24, and with an opposite extension
intended for indicating the time from 1 to 12 according to the present system,
while the main indicator is indicating the time from 12 to 24 according to the
new system.

page_text: In applying dials thus graduated and marked in combination with duplex hour-
indicators of both systems of time to time keepers, the going-mechanism of the
time keeper has to be adapted or arranged to impart one revolution to the duplex-
indicator every 24 hours, instead of two revolutions during such period as in
existing timekeepers, but any particular arrangement of the going-mechanism &
is not material to the present Invention, as the arrangement will differ in
time-keepers of different construction.
The accompanying drawing illustrates a face view of a watch adapted with a
dial graduated and marked as hereinbefore indicated in combination with a duplex
pointer formed as herein before described.
A, represents the watch; B, the dial; C, the duplex indicator; D, the minute
hand; E, the second's dial and hand. The main pointer, c, of the duplex
indicator, C, is preferably made with an outer pointer or extension of a shape or
distinguishing conformation differing from that of its opposite extension, c³, so that
it may be readily caught by the eye upon being rapidly glanced at, and so that it
may be at once recognized as the "hand" indicating the time according to the new
system, and the opposite extension or pointer, c¹, of the duplex indicator is made
either a little shorter than the pointer c, or is otherwise formed so that it also may
be at once recognized. The main pointer, c, in traversing from, 1 to, 12, indicates
the time as designated in common according to both systems, but as it begins
traversing from, 12, to, 24, where the systems differ in the designation of the hours,
while the main pointer, c, indicates the time according to the new system, the
opposite extension, c¹, thereof indicates the time according to the present system, so
that by glancing at the opposite ends of the duplex indicator the wearer will at
once see, that, for example, 20, o'clock, according to the new system, is the same
hour as he has formerly known as 8. p.m.
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
In watches and other time keepers of the kind or class hereinbefore mentioned.
The combination with a dial divided in one circle to indicate 24 hours, and
consecutively numbered from 1 to 24, of a duplex indicator caused to traverse one
complete revolution of the dial in every 24 hours and formed with opposite
extensions or pointers to indicate the time according to the different systems,
substantially as hereinbefore described with reference to the accompanying
drawing.
BOOK