Optical instrument, polarising helioscopic eyepiece, brass / glass, used at Sydney Observatory, made by Hugo Schroeder, Hamburg, Germany, 1874. A polarising helioscopic eyepiece consisting of a central brass disc with a hole in its surface. Set into the surface of the disc surrounding the hole is a rotatable brass scale. Fixed to the rotating scale is a rectangular metal structure set at an oblique angle. Inside the metal structure there is a rectangular glass lens which is held at an angle by two metal brackets. There is an additional pair of brackets for another lens however no lens is present. There is a hole in the top of the oblique metal structure into which a brass screw fitting has been attached. On the underside of the central brass disc is a metal bracket containing two additional rectangular glass lenses. The lenses are set at an angle and held in place by metal brackets.
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(Accession num: H10380)
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