Lot 110

Hans Jendritzki

An obelisk shaped precision regulator in museum-like quality, with electric winding, "upside down" detached escapement, Riefler pendulum and gear train by Strasser and Rohde, assembled by Hans Jendritzki, teacher at the watchmaking school in Hamburg. Hans Jendritzki's extensive expertise, his exceptional engineering capabilities and superior horological craftsmanship are perfectly embodied in this precision wall regulator. Very likely this is his own clock.

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The detached Graham escapement is visible behind the very delicate seconds dial. The pallets are provided with special holes for better oil retention. When triggered, the anchor is rotated in a plate-spring joint, whose impulse is transferred directly to the pendulum. The anchor and pendulum spring form a single unit here.
The clock is powered by an electric winding mechanism and has an exceptionally short gear train. The winding mechanism has mercury switches and small weights, which in this case serve as working memory.
The movement of this clock is illustrated and described in Klaus Erbrich's "Präzisionspendeluhren" (Precision Pendulum Clocks), Munich 1978, p. 240.

After completing an apprenticeship as a watchmaker with his father and spending his final year of training with Kitzki, Hans Jendritzki (1907–1996) worked as a precision watchmaker in Altona and passed his master watchmaker's examination in Berlin in 1936. He had already taken over as editor of the trade journal "Uhrmacherkunst" in 1934. In 1940, he was appointed a teacher and trainer at the Watch- and Clockmaking School in Hamburg. Jendritzki wrote numerous articles and books on the craft of watchmaking. As a watch and clockmaker, he invented improvements to the constant force escapement for balance wheels, reduction gears and the making of central second hands.
Source: de.wikipedia.org
Provenance: Former Watch and Clock Museum in Wuppertal, Germany