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Lot 12A

BRASS 3-INCH DIALYTIC REFRACTING TELESCOPE AND CASE.

21 September 2015, 13:00 EDT
New York

Sold for US$1,125 inc. premium

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BRASS 3-INCH DIALYTIC REFRACTING TELESCOPE AND CASE.

Signed Plössl in Wien, mid 19th century.
On folding tripod base, with adjustable draw tube, rack and pinion focusing, lens cap, two terrestrial eyepieces, two celestial eyepieces and solar filter, in fitted wood case with label of instructions. Length of tube 17¾" (45cm).

Georg Simon Plössl (1794 – 1868) the eminent Viennese optician is known primarily for his microscopes. However, in 1860, he introduced a telescope eyepiece consisting of two identical achromatic doublets, oriented so that the biconvex crown elements face each other with the doublets almost in contact, increasing the refraction of the field lens flint element, and reducing the diameter of the field doublet. This design of eyepiece was reintroduced in the 1960's and remains in use today.

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