Large Brass Microscope by Plössl in Vienna, c. 1852

Signed on the tube "Plössl in Wien", original lacquered brass, height 16 1/6 in., 2 three-part threaded lenses numbered 1-3 and 4-6, 2 lenses with correction, 4 eyepieces (one aplanatic to screw in), 2 micrometers, 1 large Selligue prism, 1 deflection prism for the tube, coarse and fine adjustment acting on the tube, height-adjustable diaphragm device with rocker arm adjustment under the table. The microscope is mounted rotating on a heavy brass base. Very good original mechanical and optical condition. The box is accompanied by a handwritten magnification table showing that all previously supplied optical equipment is complete. In velvet-lined case. - A rare top instrument in complete and very good condition.

布雷克拍品等级是为了方便竞买人判断拍卖品的成色而设置的。布雷克等级用1到6级来标注外观和功能的成色，(从非常好到非常差)。 在目录图册里用括号里的2个数字来表示，前一个数字表示外观成色的级别，后一个数字表示功能成色的级别。如(3/2)表示外观成色是3(满意的)，功能成色2(好)。 成色 定义参照下列标准： 1 - 非常好 (未使用过，没有使用痕迹) 2 - 好 (新，极少的使用痕迹) 3 - 满意的 (普通的使用痕迹) 4 - 及格的 (明显的使用痕迹，某个非主要部件是后配的) 5 - 有缺陷的 (极明显的使用痕迹, 某个主要部件是后配的，功能上有缺陷，需要修理) 6 - 非常差 (严重破损, 缺少重要部件)