Slide Rules and Arithmetic Tables

1) Tavernier-Gravet, France, c. 1895, Mannheim system, length 20 in., boxwood with white celluloid rest, brass nose runner, English instructions and mahogany case. - 2) Albert Nestler, Germany, c. 1930, Rietz system, no. 23R, length 11 ½ in., in wood case. - 3) H. Morin, France, c. 1850, tachymetric slide rule, marked "Caract", nickel-silver, length 17 in., in mahogany case. - 4) Faber-Castell, Germany, c. 1920, model 360, D.R.P. 206428, length 11 in., in box. - 5) Faber-Castell, Germany, c. 1955, Demegraph 2/66, patent no. 804932, length 13 in., measuring calculator for the graphic industry. - 6) Faber-Castell, Germany, 1974, model TR3, hybrid model with electronic calculator from Texas Instruments, length 6 ¾ in., untested. - 7) Faber-Castell, Germany, c. 1950, model 76/22R, hybrid model with addiator, length 5 ¾ in. - 8) Tavernier-Gravet, France, c. 1900, length 10 1/5 in., boxwood, brass nose runner. - 9) Bergmann Universal-Calculator Unical, Switzerland, c. 1940. - 10) Illgen's Rechentafel, c. 1910, Paul Illgen, Leipzig, two-dimensional alternative to the calculating drum. - 11) Faber-Castell, Germany, c. 1970, model 310/52, projection slide rule, in box. - And: 12) 7 more slide rules.

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)