US745680A - Geographical clock. - Google Patents

Description

v .UNITED SUxTES 'Patented December 1., 1903.

PATENT OFFICE-. I-

"HENRYSQHUMAGHER, or ASAN FRANCISCO., cAmFoRNiA.

., G E'oGRAPmGAL CLOCK.

vSP1-:cinica'Hort forming pur lnerim Patent Nn 745,680, aatedvnenlbe 1, 190e. i

. Application :Med Timber 36,1902, Serial No. l 3 7&096 l(No model.)

`To allfwhbm/ it 'maricon/ceram i Be it. known that I, HENRY fScHMAc'HER,

a citizen of the United lStates,residing in the city and county of San FrancisemfState of California, have invented an Improvement in Geographicalv Clocks; and I-hereby declare the following to bea full, clear, and exact de-x scription of.-the.same. .w g

My invention relatesl to improvements in tmepieoes whereby the time for anyplace in fthe 'world may be determinedinstantly l vand the time *ofl that 'fp la'ce notedrelativ'e to any other place.v .It has been 'usual in the construction of this classof yclocks to emplOy a dial turnable with the hein-'hand and on which is map'pcdsa polar projection ofthe earth or a portionLth'eref and in relation toV which dal'is a stationarydisk graduated according tothe twenty-four hours of :The day. The objection to all these clocks is that with the con tin ued rotationofj thorn-ap it isfalm ost -impossible to readthe namesloplacesit may' bedesired to learn about'rowingfto the fact.

time, and, furthermore, by reasonaailthecon- I stantv change of the position` 'fa'theplaces about the 'central axis the eye'does not read#` ily become trainedv to look inthe right direction or to thev particularspot to yfind `the locality wanted. l v One of the objectsof myy invention is to provide a clock -whereby it'will be very simpleto locate ythe various places u pon the dif.-

feient meridians and to rea'd the. time upon anymeridian. To this end I employ a stationarydal having radial `*division-lines corresponding to certa-injnnitsfof timemeasnre- "ment, between which lines are printed the names of cities lying in anycorresponding meridian interval. -Concerntricwith this disk f is a revoluble `dial making cnere'volution in twenty-four hours and having the hours marked onvweigh-ted diskspivoited to th'edial and adapted .always to maintain an upright position, so as to be easily read. This dial is movable in 4relation to a stationary vpointer which isset over the city. whence Atimeislto be measured.

more fully set forth hereinafter, having-reference tothe accompanying drawings, in

. hour-hand proper is used.

in reading the hours, II have' shownlthe latterv las numbered on weighted ldisks 6, p ivotedon Figure' Tl .is a'apiwn view of my invention-- Fig. 2Eis la section lcfa weighted hour-disk. Fig. '8 isan elevation lof the same. Fig. 4 is a chart for locating various cities.

A represents a `stationary disk fixed to the post 2, which carries the minute-hand' 3. A dial 4, carried hyga'sleeve upon the post, is

'tur-.natale within an .annular area 5 on the disk.4 The dial 4 is subdivided into twentyfour parts, one half numbered from 'l. to 12, the .usual subdivisions of time, vand. representing from midnight to midday, or a.. m., the-other half numbered from l to 12: and representing from neon-to midnighto'r p. m. The dial makes 'one revolu-` tion in twenty-fourhionrs, while the minutehand 3 nakes one complete revolution every hour.. It-Wil-l `be noted thatthe dial :serves :all the 'purposes of an.hourhand,'a nd no In order to assist 'the .dial so asalways f'tostand perpendicular. Tihediisl .is in the-formfof a 'wheel having'` a. central open space Vthrough 'which the minntenniarkings on thedi'skA are visible, as at 7,5 lf desired, the disks 6, corresponding to the hours from six p. tn. to six a. m.,may` be y black, -While those .from six a. m. to six p. m.-

inaybe white to contrast night and day. .Noon o r meridian 'is indicated by a radial projection So'nthe dial.

Theannula'r space 5 on fdisk'A is subdivided in-toequalunits Lof\time by the..radia.l .lines 9. j In the present instance these llines are -dispcsedat intervals of fifteen deg-rees on' the circle, corresponding to one hour of time. -Eweh subdivision maybe designated ysuccessively bye. letter, as indicated thus; A,

B, C,`D,.,&c. These subdivisions, it will be seen, may be considered as representing fifteen degrees of longitude as the same Vwould appear on'a spherical projectionof the earths surface. Instead, however, of laying -faceef the clock-casing concentric with the` ont a'disterted map of the earth in theanni4 inse-1I simplyprint the names of su'ch places Y -V falling withinany certain meridian interval There are further.details which will be in 'a'.- corresponding subdivision of 5. For infstancetart from WashingtomDistrict of Go- IOO i gitude west of Greenwich of which places it may'sbe desired to know the time are printed in division A and each city located within that subdivision situated in its correct relative position to the right of the`left-hand boundary-line of that division correspondingly with its actual location west of parallel of longitude seventy-tive degrees.

lao

l is a pointer movable independently of the clock mechanism beneath' the dial'land having aknifefedgeportion l()a movable over the printedsurface and adapted to be set at any particular` place whence time is to be computed. For illustration, assume the clock to be set up in SauA Francisco and the. San Francisco time at that instant to-be 3.20 p.m. The pointer or marker is moved to coincide with San Francisco, and thenceforth it .remains in that position, as it is intended v.mainly as a marker for the particular local'- only necessary to'glance at the subdivision of 5 in which that place may be and project the time intervalindicated on the part of the disk inclosed in the angle of the particularl subdivision.

To facilitate the readingof time at any city, I provide the dial 4c with an annular transparent projection 11, extending over the annulus 5 and having radial markings 12,

corresponding to hours and sixths or other suitable subdivisions of hours.

for the reason that it enables me to estimate within teu minutes of the correct time of any place.

I use sixths For, example,l when itis four oclock p. m., San..Francisco, a glance at Washington shows it to be seven p. m., approximately. London, on the line between subdivisions S and rl,'w illshow the time to be 12.10 a. m., approximately.'

By providing a chart, as 13, on which the various cities are arranged alphabetically reaeao and placing after each city the letter designating in subdivision on annulus 5 the-city can be readily located and the time determined.

Having thusdescribed my invention, what l claim, and desire to secure by Letters Patent, isl 1. In a geographical clock,'the combination of astati'on'ary disk having an annular area located between its center and outer edge, and a circle interior to the annular lspace .and subdivided radially to units of time representing minutes, said disk having its surface beyond-the annular area subdivided into equal units of time by radial lines; a'movable dial mountedin the annular area of the disk, and having an open center through which saidv minute-'markings are visible; cities marked within the radial subdivisions of the disk outside of the diala rigid pointer pivoted beneath the dial and between the same and the disk, and having a knife-edge portion to move over the sur face of thedisk; and aminute-h'andv movable in relation tothe dial, said dial serving in lieu of an hour-hand and having it's surface subdivided to representy hours.

2. ln a geographical clock, the combination of a stationary disk 'having an annular area betweeen its centerand outer edge, and having the space between said area and outer `edge subdivided radially and arbitrarily designated; a circle interior to the annulararea -of the disk and subdivided radially to reprosent minutes; a dial subdivided into hours and rotatably mounted in the annular area of the disk and having an open center to expose the minutemarkingthereof; geographical markings inl the radial subdivisions exterior to the v annular area of said'disk; and a pointer located between the disk and dial said dial having an annular transparent peripherall projection extending over the disk and having radial markings corresponding to hours and subdivisions thereof.

ln'witness whereof Ihavehereunto set my y hand. l

HENRY SCHUMACHER.

li/Vitnesses:

S. H. Nonnen, Jnssin O. BRODIE.

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