Planetarium Clock by William Perkins, 1925

Signed on hour ring "Planetarium Clock William Perkins London for Technical Institute of Cambridge 1925". Mechanical movement, lever-wound, brass plates, four-sided glazed brass case, case dimensions 7 ½ x 7 ½ x 4 ¾ in., 24-hour ring on top, brass rail with 3 additional scales for indicating the days of the week, the date and the month with additional signs of the zodiac. The planetarium consists of an terrestrial globe (Ø 4 ¾ in.), a rotating moon and a fixed sun. All the pointers, the earth and the moon are connected to each other with rods and gearwheels and are driven by the centrally located clockwork, total width 18 ½ in. - Good working original 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)