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Патент USA US2078345

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April 27, 1937-.
Filed April 24, 1936
2 Sheets-Sheet 1
By ‘g I
April 27, 1937.
2,078,345 .
Filed April 24, 1936
2 Sheets-Sheet 2
Patented Apr.- ‘27, 1937
umvsassr. TIME mnrosma CLOCK ‘
Thomas L. Robertson. Longview, Wash.
Application April 24, 1988, Boris! No. ‘10,275
1 Claim.
(01. ss-u)
pane l3 and the glass pane II is held in place
improvements in the general art-of horology and against the inturned ilange ll of the rim 8 by
This invention appertainstojnew and useful
more particularly to a novel world time indicating clock mechanism.
The principal object of the present’ invention
is to provide a clock mechanism including a ro-
tary dial having indicia thereon representing
time intervals, and a stationary dial carrying
geographical names mounted in proximity to the
10 rotary dial.
Another important object of the invention is
to provide a simply constructed world time telling clock structure which will be of ‘considerable
assistance to persons having long range short
15 wave radio receivers.
the spring members I I.
The rim I does not have any motion except
that it can be rotated until the geographical 5
location on dial I corresponding to the place
with its respective degrees of longitude in the 15
Other important objects and advantages oi’ the
invention will become apparent to the reader
same manner in which degrees of longitude are
marked on a world map. Each portion of the
of the following speci?cation.
In the drawings:—
dial 8 is further divided by a line of half hour
marks. Running laterally and continuously
Figure 1 represents a front elevational view
around the center of this dial is a mark or line 20
of the mechanism.
which is lettered “Equator". Around this rim
Figure 2 is a fragmentary side elevational view
with the main portion of the structure in ver-
8 and close to the degree or divisional line which
marks the time zones are placed the names of
tical section.
various countries of the world.
Referring to the drawings wherein like numerals designate like parts, it can be seen that
numeral 5 represents the clock back and which
on its front side has a plurality of small clips
0 secured thereto for engaging against the roll
30 ‘I on the inner edge portion of the annular rim
I. This rim is rotatable in the clips 8 to permit adjustment of the annular dial 9 with respect to the rotary dial Ill. The dial II is situated in conjunction with the pointer ii and
35 has the gear train i2 driving the same.
The dial l0 rotates in a clock-wise direction
at a speed of one revolution in twenty-four
hours, the same being carried by the gear mechanism If.‘ The dial in is marked by having a
40 line drawn diametrically therethrough the one
end portion of which is marked “Midnight” while
the other end portion is marked “Noon”. Each
half of the dial is divided into twelve equal parts
which represent the hours from one to twelve
45 A. M. and one to twelve P. M. and are so marked
in a, counter-clock-wise manner. Each hour is
then calibrated into ?ve minute periods and the
?fteen, thirty and forty-?ve minute periods are
so marked. The shaded portion of the dial iii
' 60 from six P. M, to midnight and from midnight
to six A. M. is so colored to represent the dark
part of the twenty-four hour period.
The annular dial 9 is secured against the glass
where the clock is located coincides with the
hour (indicated on dial it) representing local
time at the place where the clock is situated.
This rim 8 has its dial ! marked as follows:
The same is divided into twenty-four equal
portions, each portion representing ?fteen de
grees of longitude for one hour of time, each
division line being numbered on its outside end
These names
are placed on the inside of the Equator line if 25
they are located above the Equator and on the
outside of the Equator line if they are located
below the Equator. Names of countries on the
half hour standard are placed near the half hour
mark. The Greenwich Meridian and the date 30
line are also shown in their respective places.
While the foregoing speci?cation sets forth
the invention in speci?c terms, it is to be under
stood that numerous changes in the shape, size
and material may be resorted to without de- 35
parting from the spirit and scope of the inven
tion as claimed hereinafter.~
Having described the invention what is claimed
A clock structure comprising a back, guides 40
carried by the back, an annulus having its inner
edge rotatably supported by said guides, a clock
mechanism mounted on the back within the con
?nes of the annulus, a rotary dial carried by the
clock mechanism and having indicis thereon 45
representing time intervals, and a second dial of
annular construction secured to the outer edge
of the annulus, said second dial having its in
ner edge terminating at approximately the pe
riphery of the rotary dial and having indicia 50
thereon indicating different geographical places.
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