Equinoctial Sundial by Lorenz Graszl

Equinoctial Sundial by Lorenz Graszl

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Description
This brass universal equinoctial ring dial consists of a meridian (outer) ring, hour (inner) ring, rotating crosspiece or bridge, and sliding suspension ring/handle with two chain links. The meridian ring is calibrated for northern and southern latitudes on both sides from 90 to 0 to 80 by single degrees. The hour ring is calibrated on both sides from I to XII x 2, by I with quarter-hour divisions. There is a pinhole gnomon in the bridge which slides over a calendar scale calibrated by month (in Spanish?) and also marked with the characters of the constellations. Both sides of the meridian ring are engraved with a list of 15 cities and latitudes. One side is marked: "Coppo 25; Copupo 30; Lig 30; Qiullta Sn Jan 32; Valpso Sn Tago 33; Maule 34". The opposite side is marked: "Bucnui Menza 34; Conceptn Chilln 36; S Fee Avco 37; Saldea 40; Chilo 40". These appear to be cities in what is now Chile and Argentina. Another alternate spelling of the maker's name is "Lorenz Grassl"; he worked in Augsburg.
Location
Currently not on view
Object Name
sundial, equinoctial
date made
ca 1770
ca 1780
maker
Graszl, Lorenz
place made
Germany: Bavaria, Augsburg
Measurements
overall:.4 cm x 10.8 cm x 8.7 cm; 5/32 in x 4 1/4 in x 3 7/16 in
ID Number
MA.328737
catalog number
328737
accession number
275687
Credit Line
Gift of Mrs. Heloise Durant Seeley
subject
Mathematics
Timekeeping
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Data Source
National Museum of American History
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