Surveying and Measuring Instruments

1) Altimeter, c. 1850, by Oeri, after patent by R. Douglas, England, brass, in original case. - 2) Compass, c. 1900, Spain, 2 sights, walnut case. - 3) Caliper, pre-1870, unit of measurement up to 24 Rhenish lines, vernier reading, locking screw, made of brass and steel, in kid-lined box. - 4) Sikes's Hydrometer, c. 1900, device for determining the density of liquids, with slide rule and thermometer, in mahogany case. - 5) Pocket spectroscope, c. 1920, Goertz, Berlin, nickel-plated, length 7 in., in case. - 6) Tachometer H4b by Hommel, c. 1930, for 30 to 4000 revolutions per minute, with accessories in box. - 7) Galton whistle by Edelmann, Munich, c. 1900, for producing high-frequency tones, in case, with separate rubber ball. - And: 8) 6 further devices, items.

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)