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Lot 20

A Large & Comprehensively Equipped Petrological Microscope Outfit,

Description

A Large & Comprehensively Equipped Petrological Microscope Outfit, English, c.1890, signed ‘J Swift & Son, London’ to foot, on tall black lacquered cast brass foot with brass trunnions to top supporting main body, large plano-concave mirror to base, in gimbal-mount on an articulated arm, semi-mechanical substage above with polariser, with engraved scale, a swing out filter/stop holder, condenser assembly to top, simple stage with two clips, fully rotating stage with an engraved scale running 0-360 around perimeter, course focusing mechanism to rear with a pinion acting on diagonal rack work, polarising monocular tube with objective centring adjustment and slide in/out analyser, tube interchangeable with additional binocular tube, binocular tube with interocular rack work adjustment to top, complete with an assortment of accessories including special polarising eyepieces, including a Bertrand Quartz-Plate eyepiece, a Double-Calcite-Plate eyepiece, an eyepiece Goniometer with Selenite and Mica slides, many objectives, eyepieces and other accessories, all in a large French polished mahogany cabinet with large brass recessed campaign style handle to top

Note: Swift’s catalogue refers to this model as the ‘Advanced Student Petrological’. This was the largest petrological microscope Swift made other than the large ‘A.B. Dick’ model. The catalogue refers to the binocular option at extra cost at the end of the section on petrological microscopes.


Sold for £9,240

Lot 20

A Large & Comprehensively Equipped Petrological Microscope Outfit,

Description

A Large & Comprehensively Equipped Petrological Microscope Outfit, English, c.1890, signed ‘J Swift & Son, London’ to foot, on tall black lacquered cast brass foot with brass trunnions to top supporting main body, large plano-concave mirror to base, in gimbal-mount on an articulated arm, semi-mechanical substage above with polariser, with engraved scale, a swing out filter/stop holder, condenser assembly to top, simple stage with two clips, fully rotating stage with an engraved scale running 0-360 around perimeter, course focusing mechanism to rear with a pinion acting on diagonal rack work, polarising monocular tube with objective centring adjustment and slide in/out analyser, tube interchangeable with additional binocular tube, binocular tube with interocular rack work adjustment to top, complete with an assortment of accessories including special polarising eyepieces, including a Bertrand Quartz-Plate eyepiece, a Double-Calcite-Plate eyepiece, an eyepiece Goniometer with Selenite and Mica slides, many objectives, eyepieces and other accessories, all in a large French polished mahogany cabinet with large brass recessed campaign style handle to top

Note: Swift’s catalogue refers to this model as the ‘Advanced Student Petrological’. This was the largest petrological microscope Swift made other than the large ‘A.B. Dick’ model. The catalogue refers to the binocular option at extra cost at the end of the section on petrological microscopes.

Sold for £9,240

This auction has closed.

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