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telegraph apparatus was, at his suggestion, placed on exhibition in the Section, and attracted much attention.

Among the important objects since deposited are to be found the cross-arm and insulator laid on the line from Washington to Baltimore in 1841; a register and relay used in the first office opened in Indiana in 1848; twisted telegraph wire used in 1864; various forms of earthenware and glass insulators, and a pair of English dial telegraph instruments.

The collection showing the developemnt of the typewriting machine has received several valuable additions, among them the typewriter invented by John Pratt in 1864, which was obtained through his kindly assistance.

Messrs Wyckoff, Seamans and Benedict have added a Danish writing ball and other old forms of typewriters to their collection, among them, a model of the Sholes and Glidden typewriter invented in 1867, together with the original of one of the first ma-