A brass altitude surveying circle,
Lot 119
A brass altitude surveying circle,
Sold for £1,750 (US$ 2,794) inc. premium

Lot Details
A brass altitude surveying circle,
by J & J. Fayrer, Pentonville, London, circa 1860. Lacquered brass, the 13ins.(33cm) circle with silvered scale divided into four 90 degree arcs, the cruciform index arm with two opposed vernier scales reading to 10 seconds with two freely rotating magnifying lenses. The clamping arm with screw clamp and micro adjusting thread, topped by a full width spirit level. The entire instrument mounted onto a blackened brass backplate and housed in a circular brass case, with opening glass front window. 16ins.(41cm)diam.

Footnotes

  • James and John Fayrer, Mathmatical instrument makers, working at 66 White Lion Street, Pentonville, London between 1851-1865. Known to have also worked on Astronomic instruments, John Fayrer worked for a period dividing scales for Troughton.

    Four mounting holes and circular scuffing on the backplate suggest this circle was mounted onto a larger instrument, possible a transit instrument.
Auction information

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