Twin Marchant Calculating Machine, c. 1942

Consisting of 2 Marchant XL spoked-wheel calculating machines by Marchant Calculating Machine Co, USA, assembled in England and distributed by Block & Anderson Ltd, London & Cambridge, serial no. of the Twinplex machine: 159, both with 9 setting slides and 13 digits in the results register, various combinations possible, works. - Note: This calculating machine was used to solve mathematical problems arising in military surveying work. In the British Army, the German Brunsviga Twin 13z was used for this task but, after the start of WWII, this model was no longer available and a new model had to be developed in England at short notice.

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)