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Publication numberUS693814 A
Publication typeGrant
Publication dateFeb 18, 1902
Filing dateJun 2, 1900
Priority dateJun 2, 1900
Publication numberUS 693814 A, US 693814A, US-A-693814, US693814 A, US693814A
InventorsCharles E Davis
Original AssigneeHenry D Harrower, Charles E Davis
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Geographical clock.
US 693814 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




EQPECIFICATION forming part of Letters Patent No. 693,814, dated February 18, 1902.

Application filed June 2, 1900. Serial No. 18,910. (No model) To ctZZ whom it may concern.- Be it known that I, CHARLES E. DAVIS, a citizen of the United States of America, and

a resident of New York city, county and State 1 the combination, with time mechanism, of a.

single disk arranged to rotate with the hourhand thereof, the said disk having denoted thereon characters representing various localities throughout the world, and an outer stationary ring having the twenty-four hours of the day represented thereon, certain of these hours being denoted by transparent characters, as by cutting the characters out of the material of which the ring is made,

and certain others of the said hours being denoted by opaque characters, the surrounding portions of which are transparent. This latter may be effected by cutting portions of the material away around the said characters.

My invention further consists in providing illuminating means behind the said ring and the said disk. c

The objects of my invention are, first, to produce a simple form of geographical timepiece wherein a single geographical disk movable with the hour-hand may be used andto utilize the clock-casing as a means of support for a stationary ring having characters thereon denoting the. hours of the day and night, to divide the twenty-four hours represented on the said ringinto hours of the day and night, and to make the characters representing the night portion or that portion of the frame carrying the characters representing the night portion darker than the other portion, so that the hours ofthe day can readily be distinguished from the hours of the night during the day-time, and to so arrange the characters that, in combination with the illuminating means, the hours of the day will also be readily distinguishable from the hours of the night .during night-time.

I will now proceedto'describe a geographical timepiece embodying my invention and transparent or translucent material. disk is mounted in any suitable manner to ro- Will then point out the novel features in the claim.

In the drawings, Figure 1 represents aface View of a geographical timepiece embodying my invention. Fig. 2 represents a central Vertical section of the same with the time mechanisminclosed in an inner casing, which is shown in side elevation.

Similar reference characters designate corresponding parts in both the views.

Reference character 1 designates an outer casing and which also forms a support for the time mechanism.

2 designates an inner casing which incloses the time mechanism, which may be of any Well-known type. This time mechanism is invention; I

Reference character 3 designates a disk of This not shown: in detail, as it forms no part of this tate with the hour-hand of the time mechanism. Preferably this disk is secured to the hour-arbor, upon which is also mounted the hour-hand. The saiddisk has denoted thereon the names of various cities and countries throughout the world. The disk is preferably set so that the hour-hand points opposite to the city or country in which the timepieceis located. By theproper arrangement of the names of the localities upon the disk the correct relative time can instantly be ascertained for any locality so denoted;

' A ring 4 is relatively stationary and is preferably secured to or is a part of the casing 1.

The ringe has denoted thereon characters representing the twenty-fourhours of the day. The characters upon the upper half of the disk represent the hours from six a. m. to six p. m, while the characters on the lower half of the disk represent the hours from six p. m. to six a. m. The characters upon the upper half of the disk are preferably formed by cutting away most of the material around them and all of the metal between them, whereby light will show .around and between them, and-in the lower half of the disk the characters representing the hours are preferably formed by cutting them clear through the said ring, as a stencil is cut, andin leaving the material intact around and between them.

In this way the appearance of the lower portion of the ring in the day-time is very much darker than the upper part Reference characters 5 5 designate electric lamps which afford means for illumination Within the clock-casing. At night-time these lamps being lighted will cause a light to shine through the spaces around the characters in the upper portion of the disk and through the spaces forming the characters in the lower half of the disk. In this manner as much or even more difference will be noted between the hours of the day and night at night-time than at day-time. I may of course use any desired means for illumination and have merely shown electric lights as one of the many forms which may be employed.

What I claim is I The combination with time mechanism, of

a disk of transparent or translucent mate rial adapted to rotate with the hour-hand thereof, and having denoted thereon charac- CHARLES E. DAVIS.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5146436 *Aug 9, 1991Sep 8, 1992Wright James BUniversal world clock
US5497358 *Sep 15, 1994Mar 5, 1996Eta S.A. Fabriques D'ebauchesAnalogue display timepiece exhibiting at least one universal time display mode
US20030006607 *May 21, 2002Jan 9, 2003Hiroaki KitagawaWorld time converter for analog clock
US20060171256 *Jul 19, 2005Aug 3, 2006Keith HerbertGlobal timepiece with double day/double date rendering
US20070262004 *Nov 4, 2005Nov 15, 2007Jordan George RWater Treatment Apparatus
US20080049557 *Aug 24, 2006Feb 28, 2008Tai-Her YangCommon drive device for date/am/pm display
Cooperative ClassificationG04B19/22