Desk Camera Obscura, post-1800

Unmarked. Darkbrown painted wood, heigth 86 cm, basis measurement exactly metric 60 x 50 cm, in right angle of the wood parts finger-jointed, large lens diameter approx. 97 mm, with 53 cm focal length the same focal length as Goethe's Camera Obscura (see Bayer, "Quellendarstellungen zur Geschichte der Photographie", 1966, p. 15), for a working distance of 2.8 m, for infinity a level of 17 cm is necessary, under the drawing plate is a partition. Mirror is old, with original back, not an optical plane mirror, with new screw as safety against falling down. With later added table 60 x 49 cm, heigth 60 cm. – In addition: 5 colored copper engravings, one dated 2nd August 1675 "Fachatada Aesnoga", all about trade and nautical topics, all with cracks.

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)