Physical Demonstration Model of a James Watt-Type Beam Steam Eng

Eugène Bourdon, Paris. Early engineering model of a low-pressure beam engine with double-action cylinder, rare version with glass cylinders, brass precision parts, cast-iron frame, pillars, beam and 21 ¼-inch diameter flywheel, slide valve control, condenser with vaporizer, vacuum pump, water flap, working governor and other fittings, on wood base, overall 34 x 13 1/3 x 26 3/4 in., very good original condition, all parts smooth-running, untested with steam. - Note: Eugène Bourdon was a French engineer and inventor who patented the Bourdon spring in 1849. He manufactured around 200 model steam engines during the mid-19th century.

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)