LORENZ GRASSL German 1770 Antique Portable Octagonal Compass-Sundial In Bronze
Antique portable Augsburg equinoctial compass sundial by Lorenz Grassl.
This is an exceptional and very rare 18th-century Augsburg equinoctial compass sundial, signed “Lorenz Graßl”, dating to the late-18th century, circa 1770. A sophisticated portable pocket-size scientific instrument, it combines an adjustable equinoctial sundial with an integrated magnetic compass, reflecting the high level of precision and craftsmanship achieved by Augsburg instrument makers during the period. The instrument is masterfully constructed in an octagonal shape engraved brass and with remains of fire-gilt metal, with iron components, and is composed of a folding gnomon, hour ring, and hinged latitude arc, together with an inset magnetic compass with round dial and protective crystal. The sundial incorporates a steel dial engraved and inked with cardinal directions, while the folding latitude arc allows the hour ring to be adjusted according to geographic latitude. Accompanied by a round carved wood box from the same period to keep safe.
The combination of portability, astronomical calculation, timekeeping, and magnetic orientation makes this a fascinating example of the multifunctional scientific instruments produced in Augsburg during the 18th century. Signed L. Graßl of Augsburg, a German maker associated with precision astronomical, mathematical, and scientific instruments, the present sundial represents the sophisticated tradition of Augsburg instrument making. Comparable instruments by Augsburg makers, including members of the Vogler and Schrettegger families, are represented in important institutional and historical scientific collections.
The instrument remains in remarkably well-preserved, original condition, retaining its untouched antique surface and beautiful original patina. It has not been cleaned or aggressively restored, preserving the character and authenticity so highly valued by collectors of historical scientific instruments. A rare museum-quality survivor and highly desirable collector's piece, this Augsburg equinoctial compass sundial is an outstanding example of 18th-century German scientific craftsmanship, combining technical ingenuity, portability, elegant engraving, and exceptional historical character.
Country: Augsburg, Germany.
Period: Late 18th, circa 1770.
Manufacturer: Lorenz Grassl (1740-1805).
Materials: Engraved semi gilt bronze, iron, crystal, wood and inked steel.
Condition: Looks to be complete and functional. In original as found, not polished, with retains of all the original aged patina. Accompanied by the round carved box.
Weight: 98.85 Grams, (0.10 Kg).
Measurements: Fully displayed and opened is, H. 57.15 mm by L. 49.7 mm by D. 51.5 mm, (2.25 x 1.96 x 2.03 Inches).
Collateral: This piece is accompanied by a round carved box from the same period. We cannot assure was originally intended to keep the instrument in the box.
Hallmarks: Stamped and engraved with Roman and Arabic numbers, the maker's name and the text as follows, "ELEVA POLI OFEN 47 RON 42 WORIN & ZUIDKAH - L. GRABL".
Condition: The overall condition of this Augsburg equinoctial compass sundial by Lorenz Grassl is very nice. Beside the normal wear there is no damage. This piece was carefully inspected to guarantee the condition & authenticity.
INVENTORY REF: D090326MTTR/.7945
