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The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)

Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 273

An illustration from The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies, 1856, leaf 273
Telegraph ? By what agencies operated ? HOUSES PRINTING TELEGRAPH. 267 nal view, are shoTvn by Fig. 217; this view can give thelearner only a very general idea of its construction and oper-ation. 240. The composiiig machine is arranged within a mahog-any case, C, while the printing arrangement… … resembling those of a piano; on these keys are marked theletters of the alphabet and also a dot and a dash. Beneaththe key-board revolves an insulated iron shaft, surroundingwhich is a cylinder provided with two spiral lines of pointsprojecting up from its surface; this cylinder revolves with…

Physics

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