8 Adders and Calculating Aids

1) "The Locke Adder", C.E. Locke Mfg. Co., Kensett, Iowa, 1901 onwards, variant 2a, decorative American adder with Art-Nouveau decoration, copper-plated sheet metal. - 2) "Trick", developed by Christel Hamann, manufactured by Mercedes, Zella-Mehlis, 1912 onwards, with number slider. - 3) "Rechenhexe", c. 1940, Produx variant by Otto Meuter, with pen in case. - 4) "Rebo", c. 1925, Reybaud, Marseille, France, with number slider. - 5) "Addiator Duplex", c. 1955, manufactured by Addiator Rechenmaschinenfabrik C. Kübler, Berlin and Wolfach, with pen and instructions in leather case. - 6) "Pressler's mathematical wallet", developed Robert Maximilian Pressler, published by Waldemar Türk, 1860, with engineer's measuring jack. - 7) Wood number slider for primary schools, Fernand Platiau, Belgium, c. 1930, marked "Licence Du Brevet Master" - And: 8) "Arithmographe Troncet", Librairie Larousse, France, c. 1900, number slider.

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)