Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 151
- - 6 8 i - - s t — f . 9 0 330 MAGNETISM. (a.) To prevent confusion, a small space is left between successiveletters, a longer one between words and a still longer one betweensentences. We liere give a sbort message written in Roman and intelegrapblc characters; H 1 1 ten The ordinary telegraph… … Fig. 229. familiar with this alphabet that they understand a message from themere clicks of the lever and do not use any recording apparatus.Such an operator is said to read by sound ; his instrument is calleda sounder. Fig. 229 represents one. The sounder is placed on alocal circuit and has a…
Electricity · Magnetism
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