Compensation balance with Kullberg's auxiliary

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Compensation balance with Kullberg's auxiliary
Manufacturer	(unknown)
Production years	19th century
Production location	Switzerland

Balance with Kullgerg’s auxiliary compensation. A discontinuous compensation, for use with a steel spring.

Victor Kullberg (1824–1890) was born in Visby on the Island of Gotland, Sweden. He was trained by the Swedish chronometer maker Victor Soderburg in Stockholm in 1840 and emigrated to London in 1851. He had moved to a permanent address at 105 Liverpool Road, N1 by 1870. During his lifetime Kullberg gained many medals and awards for his work and enjoyed a truly international reputation. As well as supplying many foreign governments, he regularly submitted chronometers for the Annual Trials at Greenwich Observatory, gaining first place in 1864 with a chronometer fitted with his newly invented ‘flat rim’ balance. His inventions included several designs of compensation balance and improvements to keyless winding for pocket watches. He also designed the automatic gas-governor for controlling the temperature of the chronometer testing ovens at the Observatory. More than 500 chronometers by Kullberg were supplied to the Royal Navy alone and he can be said to have been one of the 19th century’s finest chronometer makers. On Kullberg’s death in 1890 the firm was taken over by George and Peter Wennerstrom. They were succeeded by Sanfrid Lundquist who had joined the firm in 1894 and who moved the firm to Cranford in Middlesex in 1938, trading under the name of Victor Kullberg until his death in 1947.

[edit] How it works

Two small extra bi-metallic arms are fitted; these move inwards for a rise of temperature, but cannot move outwards for a fall, as they bear up against the points of a pair of screws carried on the main bi-metallic arms.

[edit] Memories

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[edit] In the Science Museum's Records

Inv. No: 1929-71