Equinoctial sundial, known as “Augsburg clock”. The original was made by Iohann Georg Vogler (1720-1765) who belonged to the fourth generation of a legendary line of goldsmiths in Augsburg, Germany. It is in the Naval Museum of Madrid.
The Voglers contributed to the popularization of this instrument in the 18th century. The "Augsburg clocks" usually were octagonal planes that contained a compass with hinge clamps that allowed the hour scale and the limbo (with a scale of latitudes) to rotate. The originals were made of brass and glass.
Augsburg Equinoctial Sundial
Height: 3.93 inches
Width: 3.93 inches