3 English Brass Microscopes

1) R. & J. Beck Ltd., London, c. 1895, no. 24869, original lacquered brass, 90˚ tilting tripod, double mirror, substage height-adjustable condenser with iris diaphragm, graduated draw tube, coarse adjustment with 2 knurled screws, micrometer thumbscrew fine adjustment on the column, 3 objectives in a triple turret, 1 eyepiece, height of the instrument 11 ¾ in. - 2) Unmarked, c. 1895, claw foot, tilting stand, original lacquered brass, concave mirror, substage pinhole diaphragm, 2 clamps on the stage, coarse adjustment with 2 knurled screws, fine adjustment to the objective, tube screwed into the arm, 1 eyepiece, 1 objective, with bull's-eye lens and life cell in matching mahogany case, drawer for microscope slides, height 12 ¼ in. - And: 3) James Lucking, Birmingham, original lacquered and black-painted brass, claw base, double mirror, coarse adjustment with 2 knurled screws, fine adjustment on the column, 2 objectives in double turret, 1 eyepiece, height 11 2/5 in., in matching mahogany case.

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)