3 English Microscopes

1) Universal Dissecting Microscope, c. 1925, Watson & Son, London, black-painted cast-iron base, plane mirror, joint revolving arm for the lens, rack-and-pinion focussing, 2 lenses (x 6 and x 15), in matching mahogany case. - 2) R. & J. Beck, London, c. 1895, black-painted claw base, tilting stand, original lacquered brass stage and tube, substage pinhole diaphragm, stage with 2 clips, double milled-head pinion coarse adjustment, fine adjustment to the nosepiece, arm with threaded body tube, 1 ocular, 3 objective lenses, with bull's-eye lens on stand, live cell and forceps in matching traveling mahogany case, drawer with glass slides, height 12 ¼ in. - And: 3) W. Johnson & Son, London, c. 1900, no. 826, original lacquered brass, double mirror, tilting stand, substage pinhole diaphragm, double nosepiece, coarse and fine adjustment, 2 oculars, 2 objectives, in matching mahogany case, height 13 in.

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)