SI20129A - Wrist-sundial with incorporated compass - Google Patents

Abstract

The historically known sundial is bound to a fixed place and on a given location oriented along the line of the astronomical time XII/1200/ N-S. By adding a compass (3) to the analemma (1), a mobile dimension is obtained, as the right orientation can be set anywhere. The wrist-sundial with the compass, wearing a folding gnomon (2) may be carried out as a wristwatch or a little bigger upper arm watch. The given solution of a wrist-sundial with the built-in compass is foreseen as an advertising and tourist article.

Description

Wristwatch with built-in compass

The subject of the invention is a sundial with a built-in worn compass, smaller / FIG. 1 / on the wrist and larger /en.2/ on the upper arm.

The solution provided by the invention is the installation of a small compass 3 on the analogue 1, so that with the help of the compass 3 on the analogue 1, the sundial is correctly oriented, thus correctly reading the time at any locus. (Analema 1 is a plot of a clock with a timeline). A sundial known in historical periods is fixed at a particular locus oriented S-J. By incorporating compass 3 on analogue 1, the sundial is no longer necessarily a fixed element of a particular space, but can be mobile, because at any locus with compass 3, we first determine the orientation of the SJ and then read the time after the shadow thrown from the raised gnomon 2 on the anele 1 . (Gnomon 2 is a wand at sundial, from which the shadow cast on analema 1 shows the current time on it, in the sun of course!). The angle of the raised gnomon 2 is 45 ° to the aneloma 1, which is at our latitude at the time of the equinoxes as the sun's rays on the earth at 12 °°.

The inclination of gnomon 2 45 ° towards the anelemia 1 to give transparent, not too long or too short a shadow at the mid-latitude on the anemia 1, which can be read satisfactorily.

The proposed wristwatch with integrated compass consists of:

1. From analogue 1, with a time scale for astronomical and summer time.

2. Gnomon 2, which, for convenience, is collapsible and is raised at an angle of 45 ° to the aneloma 1.

3. Compass 3 on the plane of anale 1, which is oriented S-J in the reading of time, along the time line ΧΠ / noon /, for astronomical time, or I / 13 ° 7, for summer time.

4. Strap 4 to place the sundial on the wrist of the left hand, or on the left upper arm.

The solution provides two sizes of a wristwatch with a compass: To wear a rounded dim sum on your wrist. 73 x 42 mm / wl.l/ and dimpled, rounded to the upper arm. 132 x 74 mm /en.2/.

Intended Material: All but liquid-enclosed magnetic needles, impeccable plastic resistant to sun, salt water and shocks, in a light color tone.

The legality of operation and the principle of making a sundial is today well-known first explained by Marcus Pollio Vitruvius in X. Books on Architecture, namely in IX. book, in chapters eight and ninth. We know the mountain mountaineering clock from Velika planina, which is small, portable, but is only useful for accurate knowledge of the direction of the sky at a particular locus.

A wristwatch with a compass is intended to be a few hundred tolars worth of items that can be a casual gift, a promotional item, a souvenir of a place.

Andrej Kavčič

Claims (1)

PATENT APPLICATION T A wristwatch with a built-in compass having a collapsible gnomon (2) characterized in that the compass (3) has an aneloma (1) which allows orientation along the XII / 12 ° 7 line on the anelemia (1) in the direction SJ at any mid-latitude locus and thus a possible reading of time.