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    Default December 2009. Strasser and Rohde. Precision Regulator

    Strasser and Rohde

    Precision regulator

    Mahogany, brass, steel, ruby
    Height: 230 cm. Width: 64 cm. Depth: 30 cm.
    Dial, movement and pendulum signed: Strasser & Rohde Glashtte i/Sachs
    Dial engraved: N 790
    Pendulum-rod engraved: N 210

    Early 20th century

    The mahogany-veneered case is shaped like a majestic portico, flanked with columns and graced with an arched pediment.

    The dial is characteristic of precision regulators, with the eccentric hour and seconds chapters at the top and bottom respectively, and the minutes, indicated by a blued steel central hand, on the outer chapter ring.

    The movement has a Strasser escapement, which can be seen through the dial. This free constant-force escapement provides complete liberty for the oscillations of the pendulum, which receives the impulse shock-free and, by means of a four-part suspension spring, independently of the movement. The pendulum is suspended by the two inner springs, firmly fixed to a steel bracket. The impulse is provided by the two outer springs, which are flexed by a bridge fixed to the pallets. The impulse springs are always flexed through a constant angle. The force imparted to the pendulum is absolutely constant because it is independent of the train.

    The pendulum bob, which is fitted to the end of an invar rod, consists of two nickel-steel cylinders, connected by two transversal brass bands. Fitted to the middle of the pendulum rod is a regulating tray for putting metal strips to correct the slightest rate variation.

    The International Museum of Horology has another regulator made by Strasser and Rohde. With a simpler case and designed to be hung on the wall, it houses a type A movement also fitted with a Strasser free escapement and a compensation pendulum.

    Strasser and Rohde was founded in 1875 by Ludwig Strasser, the former director of the watch school in Glashtte, and Gustav Rohde, a mechanic. It specialised in the manufacture of precision regulators.

    Erbrich 1978, p. 203, illus.
    Herkner, 1978, pp. 266-278.
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