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The bullseye condenser is made from brass and has a plano-convex lens. The instrument has a circular base which is weighted and a thumbscrew-style end on the arm to help maneuver the condenser lens. The instrument would have been used to direct light onto a specimen for observation from a candle or lamp. The words "BROADHURST CLARKSON & Co, 63 FARRINGDON ROAD LONDON E. C." are etched into the base.
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Bullseye Condenser
c. 1850s