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Hartnack and Prazmowski German Compound Microscope

Signed "E. Hartnack & A. Prazmowski Rue Bonaparte, 1, Paris", this German brass microscope is equipped with an assortment of accessories and an elegant wooden case. The model illustrated below was redrawn from photographs of the original microscope, which was photographed and described by Gerard Turner in his excellent catalog of microscopes from the Institute and Museum of the History of Science in Florence, Italy.

A leaded brass horseshoe-shaped foot supports the microscope, which is mounted on a brass pillar that holds the mirror, stage, condenser, and body tube. A vulcanite surface protects the square stage, and a plano-concave mirror is mounted on a swinging arm beneath the condenser. Beneath the stage is a collar for an Abbe illuminator equipped with an iris diaphragm. Focus is achieved by a rackwork set that translates the body tube up and down with respect to the stage. The eyepiece is a Huygenian-style containing two lenses, and the interchangeable objectives are screwed into the nosepiece at the other end of the body tube. Accessories are stored in a mahogany box, which is lined with purple velvet and contains a wide spectrum of optical pieces, including spare eyepieces, objectives, condenser lenses, and other assorted parts.

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