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A fine and rare 19th-Century "Grand American" lacquered-brass compound monocular microscope
Details
A fine and rare 19th-Century "Grand American" lacquered-brass compound monocular microscope
Joseph Zentmayer, Philadelphia, c.1870
signed on the foot J. Zentmayer Maker Philadelphia No1178 , the binocular body-tube with rack and pinion eyepiece adjustment, rack and pinion focusing with micrometer fine adjustment and Wenham prism, raised on a pierced curved limb over the graduated circular stage with freely-moving object carriage held by a screw clamp, the substage condensor mount with aperture disc and rack and pinion adjustment, and plano-concave substage mirror, the main limb tilting between two brass columns from the graduated circular base with three splayed feet, with a large table bull's-eye condensor, two eyepieces and a further three in a mahogany accessory case, also with a Zentmayer 8/10 objective and a 1/5 objective in canisters, object mount with stage forceps and prismatic eyepiece attachment (the later board in the case is cut only for three eyepieces, the prismatic attachment and two objective canisters), all contained in a mahogany carrying case with brass handle and an original (post 1865) Zentmayer catalogue (somewhat distressed)
The case -- 19½in. (49.5cm.) high
Joseph Zentmayer, Philadelphia, c.1870
signed on the foot J. Zentmayer Maker Philadelphia N
The case -- 19½in. (49.5cm.) high