Ferdinand Braun's Cathode Ray Tube, c. 1900

The "great-grandmother" of the television tube! Cold cathode tube, hand-blown glass, with cathode and anode for 10,000 to 20,000 V, aluminum plate with pinhole and 3 ½ in. diameter screen, length of the tube 23 1/5 in. – Ferdinand Braun, born in Fulda in 1850, developed his first cathode-ray tube at the University of Strasbourg in 1898. For that and other inventions he received the Nobel price in 1909 together with Marconi. – This tube offered here is an original Braun's tube, probably the only existing still in working condition!

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)