Portable Horizontal Sundial

Description:

This square horizontal sundial consists of a brass dial and gnomon, a wooden base, and a silver compass inset in the center of the dial. The compass has a needle and four points. The dial is calibrated from 1 to 12 and from 1 to 12 for a total of twenty-four hours. Each hour is divided into eight parts. Inside this calibration, the dial is calibrated again from I to XII with the hour divided into four parts. The gnomon folds up to a vertical position. The dial is screwed to the wooden base in four places. The base is covered with red paper.

Location: Currently not on view

Subject: MathematicsTimekeeping

Subject:

See more items in: Medicine and Science: Mathematics, Science & Mathematics

Exhibition:

Exhibition Location:

Data Source: National Museum of American History

Id Number: MA.330847Accession Number: 305777Catalog Number: 330847

Object Name: sundial

Measurements: overall: 1.5 cm x 8.1 cm x 8.2 cm; 19/32 in x 3 3/16 in x 3 7/32 in

Guid: http://n2t.net/ark:/65665/ng49ca746aa-9a42-704b-e053-15f76fa0b4fa

Record Id: nmah_1215131

Our collection database is a work in progress. We may update this record based on further research and review. Learn more about our approach to sharing our collection online.

If you would like to know how you can use content on this page, see the Smithsonian's Terms of Use. If you need to request an image for publication or other use, please visit Rights and Reproductions.