Penrose Spectroscope Camera, c. 1900

A.W. Penrose, London. For 5 single exposures on plates of up to 92 x 122 mm in sliding book-form holder, mahogany with brass fittings and a long extendable filter holder as aperture, spectroscope lens with a focal length of approx. 28 cm, slit width of 14.3 mm can be moved horizontally with inset holder, spectral slit width can be adjustable vertically, with cassette slide and original lens cap as flap, good working condition, cassette missing right-hand screw, however functionality unaffected. - Note: According to the scale, five partial exposures of varying intensities can be produced. The 400-700 nm spectrometer scale plate can be pressed down separately on the photosensitive surface after removing the dark-slide cassette. An attractive piece of photographic equipment for a historic laboratory

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)