Detent escapement with Elinvar hairspring

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Detent escapement with Elinvar hairspring
Manufacturer	M. Paul Ditisheim
Production years	20th century
Production location	Switzerland

Elinvar is an alloy, introduced about 1920 by Dr C. E. Guillaume in connection with his researches on the properties of nickel-steels.

[edit] How it works

Elinvar's modulus of elasticity remains nearly constant over ordinary ranges of temperature and, when employed for the hairspring of a watch or chronometer, it almost dispenses with the necessity of any from of temperature compensation. Such compensation as is necessary can, however, be obtained by adding short bi-metallic blades to an uncut mono-metallic balance, as in the Ditisheim balance employed in this example, made by M. Paul Ditisheim, 1925. The escapement is mounted in a frame which forms an inter-changeable portion of the adjacent marine chronometer. Two models on a magnified scale of balances employed with the elinvar hairspring are also shown.

[edit] Memories

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[edit] In the Science Museum's Records

Inv. No: 1925-193