Bright's Bell Acoustic Telegraph Sounder, 1855

Invented by Charles Bright, with 2 sounders and double relays, in mahogany superstructure with brass plaque "P.O. 151", 15 x 10 x 13 in. – Note: This type of device was used by the British and Irish Magnetic Telegraph Company between 1855 and 1868. Capable of receiving acoustically and using a separate pair of tappers with different sounds, the telegraph requires only a single wire circuit and works with the "European Alphabet", a German adaptation of the American Code. This type of telegraph was soon made obsolete by the Morse telegraph sounder. – The earliest form of acoustic telegraph instrument used in Great Britain.

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)