| This is a German water gilt and silver mounted pocket universal sundial and is inscribed 'Johan Martin Augsburg 48'. Johan Martin of Augsburg was born 1642 and died 1720.
The Dial has a crescent shaped gnomon which may be adjusted for the season of the year. Time is indicated when the shadow of one of the tops of the gnomon falls exactly upon the central line of one of the two arcs of equatorial circles.
Provision is made for use in various latitudes and the base plate carries a list of towns with their latitudes. On the underside is a perpetual calendar incorporating the signs of the Zodiac.
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