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Aluminum Twin Telescopes
|Main Tube Length||10.0in||254mm|
|Objective Clear Aperture Diameter||1.38in||35mm|
This large pair of binoculars has parallel aluminum barrels, originally covered with leather. The objective lenses are achromatic doublets, contained in aluminum cells. It has long aluminum eyepiece tubes, four lens eyepieces, and flared eyecups. The thumbwheel with its axel perpendicular to the barrels adjusts the barrels' separation, to adjust for different eye spacing. The other thumbwheel, whose axel runs parallel to the barrels, is used for focusing. The objective lenses have extendable sunshades. Both the sunshade segments and the main barrels were originally covered in leather. The binoculars are not signed. A small star has been etched on one of the the objective tubes beneath the sunshade. The star also appears on an interior brass tube (of the same side) containing the field lens and eye lens.
College of Optical Sciences
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