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There is one object associated with "Troughton&Simms".

Micrometer by Troughton and Simms, used by the 1874 Dutch expedition on Reunion

The director of the Leiden Observatory, Frederik Kaiser, bought this micrometer after Airy in 1858. The micrometer was lent to the 1874 expedition to Reunion.

Troughton & Simms, London, 1858

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