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Early Swift Portable Petrological brass microscope

A striking and unsual early 20th century model of a portable petrological microscope. It is signed, "J. Swift & Son, London W., patent 24960", on the stand, and bears a strong resemblence to the "Discovery" model of 1901. Its diminuative stature is unlike other petrological microscopes of that era. It measures 11" tall in closed position. Coarse focus is rack and pinion, fine focus with a micrometer knob. Both controls are in full working order. It has a rotating stage with micrometer marked indicator dial. The condenser is a rotating nicol prism with indicator marks. The built-in slide-out analayser fits above the dual nosepiece. The microscope comes with three original signed Swift lenses: a 1" with rear body cap, a 1 " with brass canister, and a " also with brass canister. The single eyepiece has a built-in cross hair. The optical system is excellent, producing sharp petrological images of good color and contrast. The plano-concave mirror is in excellent condition on both sides. The instrument rests on four legs with cork insert tips. The rear two legs swivel up out of the way for compact storage in the original case, which has a latch and lock but no key. The mahogany case is hand dove-tailed and has a decorative bamboo carry handle. The case is in very good usable condition, noting a scratch across the front lid and an age crack on the bottom. A part of the interior accessory holder is also missing a piece. The microscope is finished in lacquered brass and black japaned base. The coverage is complete with minor age wear overall. This is a rare portable and petrological form of the popular "Discovery" style that was made to accompany Scott on his Antarctic Expedition of 1901.

Item 1273

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