Twin-Cylinder Rack-Balancing Steam Engine with Boiler House, c.

Demonstration model of a pumping station, engraved on plaque: "Bateman & Sharratt, Rack Engine 60 H.P., Manchester Eng, 1794 to 1824", two vertical cylinders, Ø 1 ½ in. each, upwards emerging racks, drive on central gear wheel, valve control with rack gear, beam connected with a chain to the pump, 8-inch flywheel, 2 side-mounted lead and sheet steel boilers with pressure safety valves, in later painted pine engine house, overall dimensions 32 1/3 x 11 3/5 x 21 in. - An exceptionally interesting model of an early English steam engine, in very good working condition, tested with compressed air.

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)