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A late 19th-Century German lacquered- and oxidised-brass Quartzkeilcomparator nach Michel-Lévy,
A late 19th-Century German lacquered- and oxidised-brass Quartzkeilcomparator nach Michel-Lévy,

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A late 19th-Century German lacquered- and oxidised-brass Quartzkeilcomparator nach Michel-Lévy, by R. FUESS BERLIN-STEGLITZ, comprising a plano-concave mirror and a prism atop a small graduated radial stage above a body-tube with rack and pinion adjustment with graduated scale and vernier to a lens half-way down, at the bottom end a short telescopic attachment with detachable eye-piece, in the original fitted, plush-lined, maroon leather-covered case -- 7in. (17.7cm.) wide See Illustration
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