US2680308A - Terrestrial globe - Google Patents

Description

June 8, 1954 F. MILTENBERGER 2,680,308

TERRESTRIAL GLOBE Filed Aug. 12. 1952 INVGULOF.

Patented June 8, 1954 UNITED STATES PATENT OFFICE,

TERRESTRIAL GLOBE Ferdinand Miltenberger, Schoningen, Germany Application August 12, 1952, Serial No. 303,914 (CI. 35-47) 1 Claim. 1

This invention relates to a terrestrial globe.

It is an object of the present invention to provide a terrestrial globe which permits to demonstrate the changes in the solar radiation of the earth, more particularly, for educational and training purposes.

A special object of the invention is to provide means permitting a favorable observation of the 'ght and shadow conditions on the terrestrial globe even in rooms which are not darkened.

According to the invention the terrestrial globe whose axis is inclined relatively to the apparent solar plane by the inclination of the ecliptic, consists of a transparent or translucent material adapted for applying, or having applied thereto, a map of the world, a source of light with a screen or reflector being mounted within said globe so as to be rotatable about a vertical axis, the adjustment of the source of light and the size of the screen or reflector being adapted so that always one half of the terrestrial globe is illuminated, and the other darkened, by the interior source of light.

Other and further objects, features and advantages of the invention will be pointed out hereinafter and appear in the appended claim forming part of the application.

In the accompanying drawing a now preferred embodhnent of the invention is shown by way of illustration and not by way of limitation.

Referring to the drawing in greater detail, it will be seen that the terrestrial globe 38, 39 is mounted on a base I Whose upwardly extending column portion 2 supports a semicircular bail 3 representing a half meridian which is secured to the hollow upright portion 2 of the base by means of a nut ii screwed on a bolt 5 extending through a bore 7 of portion 2 and formed with an eye 4 embracing the bail 3. The bail 3 is seated in a transverse groove 8 of the portion 2 whereby it is safely held. The lower end of the bail 3 bears a disc 9 on which is supported a ring it surrounding a carrier arm I! which is formed with an extension I2 carrying an illuminating device which will be hereinafter described. Arranged in the lower end of the arm I l is a downwardly and upwardly protruding sleeve-shaped bushing i3 for the rotatable mounting of a solid shaft I A. The lower end of this solid shaft I t bears a rotatable operating knob [5 connected with the shaft with the aid of a screw it and provided on its circumference with a monthly division. Mounted on the upper end of the solid shaft I l protruding from the sleeve [3, by means of a screw I9, is a toothed wheel I! having a hub I8 and being operatively connected to a further toothed wheel 22 through a toothed wheel 20 which is loosely rotatable on a small shaft 2|. The toothed wheel 22 is rotatable about an upright shaft 23. Connected to the toothed wheel 22, through a sleeve 24, is a screen or reflector 25 provided with a central source of light 26. The sleeve 24 which is secured on the shaft 23 by split pins 21, bears two slip rings 23 and 29 which are axially spaced from each other and connected to a source of light in the form of an incandescent lamp 26, by a cable 30. The socket of the incandescent lamp 26 is adjustable in the center of the screen 25 by means of an intermecliate threaded sleeve 3 l, in order to be able to accurately adjust the source of light in the screen. The slip rings 28, 29 are engaged by wiping spring contacts 32, 33 secured to the upright part 34 of the extension I2. The spring contacts 32, 33 are connected by a cable 35 pressed along the carrier arm I I, through a push button switch 36, to any suitable source of current.

The opposite end 37 of bent. Arranged between this inwardly bent end 31 of the bail 3 and the supporting or holding ring I0 is a hollow sphere consisting of two halves 38, 39 which sphere is intended to repre-, sent the terrestrial globe and bears for instance on its outer superficies a map of the world. Said sphere consists of a transparent or translucent material, for instance of a transparent synthetic material. The solid shaft l4 and the bent off part 31 of the bail 3 are arranged in such a way that they are coaxially aligned and represent the inclined axis of the earth.

The transparent terrestrial globe 33, 39 can be rotated by hand about the said axis of the earth. Arranged on the disc 59, at Git, is a stationary setting mark for setting one of the months whose names are marked on the rotary knob iii, in other words, for establishing the conditions of solar radiation existing during the respective month.

By rotating the knob IS the member 25 serving as a reflector and/ or diaphragm can be turned about the pivot 23, through the solid shaft i l and the three toothed wheels ll, 20, 22.

By means of the reflector 25 the light of the source of light 26 on the one hand is projected onto the transparent globe from inside in such a way that the solar radiation and illumination of the terrestrial globe can be illustrated thereby, and on the other hand the reflector 25 acts as a diaphragm for darkening the other part of the bail 3 is inwardly 3 the terrestrial globe representing the half of the earth which is not lighted by the sun.

If the rotary knob I5 is set to a definite month, the source of light by rotation is moved into such a position in relation to the globe which is rotatable about the "axis of the earth that a relatively perfect likeness with the conditions of solar radiation existing in the respective month is created. By rotation of the globe this solar radiation can be demonstrated for any part of the earth. Thus by one complete 360 revolution of the rotary knob IS the annular circulation of the earth about the sun can be shown as the light and shadow conditions.

The semi-spheres of transparent or translucent material are interconnected at the points of contact by projecting pins M and complementary recesses 42.

While the invention has been described in detail with respect to a now preferred example and embodiment of the invention it will be understood by those skilled in the art after understanding the invention that various changes and modifications may be made Without departing from the spirit and scope of the invention and it is in tended, therefore, to cover all such changes and modifications in the appended claim.

I claim:

Two part world globe of transparent or translucent material with inner illumination, with a polar axis inclined to the vertical by the angle of the ecliptic and with a light source with dimmer screen rotatable 0n the inside of the globe about a vertical axis, characterized in that the light source, which is arranged pivotably upon a vertical axis and has an effect which is as surface-like as possible, projects from the center of the globe, and that the drive for this light source with its dimmer screen takes place through a drive which lies in the polar axis of the globe and includes gears arranged so that the direction of rotation of that drive corresponds to the direction of rotation of the light source with its dimmer screen.

References Cited in the file Of this patent UNITED STATES PATENTS Number Name Date 1,515,135 Alexander Nov. 11, 1924 1,814,984 Vanderhider July 14, 1931 2,544,057 Vanderhider Mar. 6, 1951 FOREIGN PATENTS Number Country Date 609,662 Great Britain Oct. 5, 1948

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