Swift Portable Binocular Petrological brass microscope 

A rare binocular and portable petrological version of the expedition model by Swift dating to early in the  20th century.  It is signed, "J. Swift & Son, London W., patent 24960", on the stand, and bears a strong resemblance to the "Discovery" model of 1901. Its diminutive stature is unlike other Wenham binocular microscopes of that era. It measures only 11" when folded for storage, and stands 13 1/2" tall in its closed position. Coarse focus is rack and pinion, fine focus with a micrometer knob. Both controls are in full working order. It is equipped with the patented Will Traviss mechanical roller slide stage, and also has a separate sliding slide stage. One substage condenser is a rotating nicol prism, and accompanying analyser.  The analyser screws between the nosepiece and lens, and is can also be rotated. The other condenser is an Abbe type with variable iris diaphragm and centering thumb screws.  The microscope comes with two original signed Swift lenses: a 2/3", and a 1/6", both with brass canisters.  The 2/3" is also marked with a crown and the letters, "B.M.", and "B.D."  There are two binocular eyepieces and a separate monocular eyepiece marked as 8x.  The optical system is excellent, producing sharp images of good color and contrast.  The nicol prisms are in particularly fine condition for an instrument of this age.  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 brass carry handle. The case is in good usable condition, noting an age crack the length of the front lid. The microscope is finished in lacquered brass and black japanned base. The coverage is complete with minor age wear overall. This is a rare portable binocular form of the popular "Discovery" style that was made to accompany Scott on his Antarctic Expedition of 1901.

Item 1328

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