Astronomical lens, 7 1/4-inch, brass / glass, made by Merz and Son, Munich, Germany, 1860-1861, used at Sydney Observatory, Sydney, New South Wales, Australia Circular telescope lens in a brass casing, lens secured to the casing with 3 screws, 5 screw holes in the projecting outer rim. Called an objective glass lens, the lens has a focal length of 315cm (10 feet 4 inches). Cited in reference to Observatory stock number 41, 'Old Astrograph'.
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(Accession num: H10187)
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