現場拍賣 9290SCIENTIFIC, MEDICAL AND ENGINEERING WORKS OF ART,INS & MODS
A fine late 19th-Century Wollaston-type reflecting goniometer,
拍品 131A

A fine late 19th-Century Wollaston-type reflecting goniometer,

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GBP 2,115

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A fine late 19th-Century Wollaston-type reflecting goniometer,
unsigned, the 5¼-inch diameter lacquered-brass vertical circle with silvered outside scale (very streaked) and simple articulated specimen holder, on a black oxidised-brass triangular support and a circular painted cast iron base -- 7in. (17.8cm.) high
See Colour Illustration

專家說明

This is an example of the earliest form of Wollaston-type reflective goniometer, lacking the telescope or reflecting mirror of later instruments. These appear in the mineralogy literature of the mid nineteenth century and early, although the example offered here is probably from the last quarter of the century. Its relative simplicity suggests that it was almost certainly a student's model.