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Dancer Divisible Objective

The divisible objective is shown with (1)its inner threaded fitting, (2)a central stop to fit over the inner fitting, (3)the outer lens for higher power which slides over the inner element, and (4)a lieberkuhn fitting over the outer element for high power viewing of opaque specimens. The outer lens has a slot to register on a pin on the inner element. None of these have any maker's markings.