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 269
ate the telegraph more successfully whendistributed along the line. Such batteries will work for about two weeks with-out replenishing. Various other forms of batteries are adopted, as BunsensCharcoal, Daniells Self-protecting, etc. Telegraphs, in some instances, are saidto have been worked by the… … Register, and one which is now generally used with Morseslines. ^ * Thesigns employed by Professor Morse are the following : These dotsand marks are used to represent the various letters expressing the words orsentence transmitted : NUMERALS. u V z & - This combination of lines and dots is…
Physics
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