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3. M. Braaten by ) 7-3 Dec. 30, 1941. A. M. BRAATEN 2,268,239 INTERNATIONAL CHRONOMETER Filed Feb. 23, 1938 2 Sheets-Sheet l WWWWSX ; OON WWS Syae SSSSSSASSSSSSSSSSaaSaaSaaSaaSasasas SaaSaaSSSSSSSSSSSSSSE. araw 747.Nassess a f2 avaayaaaaaaaayaaZayala INVENTOR, 3. M. BRAATEN BY ) 7-3. /left ACM ATTORNEY. Dec. 30, 1941. A. M. BRAATEN 2,268,239 INTERNATIONAL CHRONOMETER Filed Feb. 23, 1938 2. Sheets-Sheet 2 H. Yaway. WKYV-Yvyava'SSNSASSAS Yavy vaSWasayayavay's wavy Avay s v N As M NC&NSray NNNN asses - - 2232 INVENTOR. BY )f-g 2.ARHURM, BRAATEN ATTORNEY. Patented Dec. 30, 1941 2,268,239 UNITED STATES PATENT OFFICE 2,268,239 NTERNATIONAL CBRONOMETER, Arthur M. Braaten, Riverhead, N.Y., assignor to Radio Corporaticn of America, a corporation of Delaware Application February 23, 1938, Serial No. 191,864 9 Claims. (C. 58-43) This invention relates to the art of reckoning curate and useful means of determining the time time and deals more specifically with a chronome in any part of the world. ter or international time clock which gives the The present invention may best be described standard time in any part of the world. The by reference to the accompanying drawings, dial and the mechanism of the clock are so ar which shows one specific embodiment of the ranged as to show directly standard time and Sae. Greenwich mean time in any part of the world, Referring now to the drawings, Fig. 1 is a front and also the local time of the place at which elevation showing the chronometer face; the clock is located. Fig. 2 is a section taken on line 2-2 of Fig. 1; An object of this invention is to simplify and O Fig. 3 is a partial front elevation showing an improve chronometers, so that in addition to the other embodiment; local time, a direct reading of standard time and Fig. 4 is a partial section of Fig. 3; Greenwich mean time in any part of the world Fig. 5 is a partial section of a further embodi may be readily obtained. ment; . Another object of this invention is to provide 5 Fig. 6 is a detail section showing a modifica an improved chronometer with a twenty-four tion of Figs. 4 and 5; and hour movement and to associate therewith a ro Fig. 7 is a detail section showing another mod tating geographical scale and a rotatable scale ification of Figs, 4 and 5. indicating Greenwich mean time. Referring now to Figs. 1 and 2 of the draw Because of the rotation of the earth on its ings, is a stationary, twenty-four hour time dial axis fron West to east, sunrise takes place at any and is to be used in connection with a timepiece given point earlier than at a place to the west having a twenty-four hour movement. This dial of that point. This means that all places east is suitably marked to indicate the hours 1 to of a given meridian are ahead in time, while 12 a.m. and also 1 to 12 p.m. Extending over those west are behind. Since the earth makes 2 5 to the face of dial are hour hand 4 and minute One complete rotation in twenty-four hours, it hand 5. The latter hand extends slightly beyond takes exactly one hour for the sun to make a the hour hand. Both hands are operated by any transit across the space between the meridians suitable time clock mechanism 6. Hands 4 and of two places separated by fifteen degrees in 5 are arranged to indicate on dial the local time longitude. By international agreement, the world 30 at any place at which the timepiece is to be used. has been divided into time zones, each fifteen Located within dial f is a ring-like disc or annu degrees of longitude in width. The time in each lus 2 which may be rotated about an axis pass zone is the same as that of the meridian passing ing through its center, by any suitable manual through its center, and the times in adjacent means, such as for example, a finger engaging zones differ by one hour. All time is reckoned 35 depressed portion 7. Ring 2 is marked to show from the prime meridian of Greenwich, the time Greenwich mean time and is arranged so that on that meridian being termed Greenwich mean it can be manually set to show the G. M. T. cor time, or C. M. T. Most of the countries of the responding to the local time at any given place. world follow the international time system, but Within the center of the chronometer there is a few use the local time of some important city. 40 located a movable disc 3 which normally travels Heretofore, in order to determine the time at with hour hand 4 and is equipped with a disc like clamp or friction clutch 8 which, by means any place in relation to the time at any other of a plurality of spring members 9, applies place, it has been necessary to consult tables or through a plurality of fingers O friction, so as make use of conversion charts. This procedure to engage the underside of dial 3. The lower end is both inconvenient and unsatisfactory, because of fingers ?o are retained in place by means of of the time required in making the conversions nuts f. A depressed finger engaging portion and the great possibility of making errors. Since 7a is provided preferably on the outside of dial it is desirable to be able to determine accurately 3, so as to allow its being set manually in any the time in any part of the world with the least desired position with respect to hour hand 4. amount of effort, the present invention was The face of dial is laid out in sections corre brought forth to give this time directly from the sponding to the international time zones, each dial, thus doing away with the necessity of using Section covering fifteen degrees of longitude. In tables and conversion charts. It is therefore an the center of the disc 3, sections are marked in object of this invention to provide a more ac- the degrees longitude, east and west of Green 2 2,268,289 wich, of the meridians of the time zones. In being the same all over the world. At the same each section are indicated the principal country, time it is 1:00 a. m. in Alaska, noon in middle or countries, of the corresponding time zone. Europe, 4:30 p.m. in India, 8:00 p.m. in Japan, Since some countries use a time which differs 8:30 p.m. in central Australia, and 10:30 p.m. from standard time by one-half hour, these coun in New Zealand. While it is 11:30 p.m. of a cer tries are indicated on the movable disc 3 as be tain day in British Samoa, it is 10:30 p.m. of ing small sections formed from an equal portion the new day in New Zealand as the international of each of two adjacent standard time hour Sec. date line is situated between these two countries. tions. For protection against dust, moisture, etc., This is because Samoa lies between the 180th the entire mechanism is preferably enclosed with 10 meridian and midnight on the clock dial. In in a suitable casing 2 with a glass face 3. CrOSsing the 180th meridian, the international The embodiment shown by Figs. 3 and 4 is in date line, from east longitude to west longitude, general similar to Figs. 1 and 2, except that dial a day is lost; in crossing from the opposite di 3 is positively secured to the hour hand. 4 by rection, a day is gained. When the midnight means of a threaded pin 4 and washer. 5, the line is passed by the pointer on the dial, there dial 3 having located on its surface twenty-four is, of course, also a change in the date. In going holes equally spaced in the center of each hour around the dial clockwise, it is one date from the section to receive pin 4. This arrangement does 180th meridian to midnight, and another date, away with the friction drive or clutch 8 and its. or the following day, for the rest of the way associated elements 9, 10, t. Ring 2 is sup 20 around the dial. ported by means of a plurality of equally spaced Furthermore, in Fig. 1 of the drawings, only posts f6 which support a track fl. The under one-hour divisions are shown on disc . It side of ring 2 has spring clips 8 that grip in should be understood, however, that divisions of frictional engagement track 7, ring being fixed . one minute could be used on the dial. Of course, to the casing .2b by any suitable means. 25 on a larger disc 3, more countries could be indi The other embodiment shown by Fig. 5 is sim cated in the various zones. Countries differing ilar to Fig. 4, except that the rings and 2 are from standard time could be indicated thus "Al reversed in position, that is, ring 2a is outside geria, -9 minutes.” If it were desired to indi and ring fa inside, a plurality of spacers 20 and cate only the more important countries in the 2 securing ring a to case 2a, by means of various zones, the clock could be arranged to screws 22 and 23.
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