"MAC – Mechanical Analogue Computer" for Flight Simulation, 1958

Manufactured by Air Trainers Link Ltd., Aylesbury, England. World's 1st tape-operated mechanical analogue computer for flight simulation and teaching purposes, constructed along the concept of a "tape-connected" computer applied to large flight-equation simulation systems by the same company at the end of WW II. Containing wheel and roller units, multiplier units, bell crank and scaling units and other mechanical parts; the connections between the units are made of steel tapes. Overall size: 64 x 24 x 77 in. Only one other example is known worldwide, exhibited in the Science Museum, London.

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)