A Focault knife-edge test apparatus by Weiss, English, late 19th century,
140
A Focault knife-edge test apparatus by Weiss, English, late 19th century,
the mahogany case fitted with bench mirror with peep-hole, glass panel on stand, and other apparatus completing the set, each stand with brass support on gilt decorated cast iron flared base - 20in (51cm) wide
Sold for £475 inc. premium

Footnotes

  • Focault's knife-edge test was used by amateur astronomers to measure mirror surface dimensions by reflecting light into a knife edge at or near the centre radius of mirror curvature.

Category: Collectibles / Scientific Instruments

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