Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 269
ienced operator to*get the back-stroke, in which case he dampens the np-stroke ofthe sounder with his finger until the ear catches the down-strokeagain. In the selection of the combinations which make up the codeof signals, the principle, the easy signal for the frequent letter, is observed… … 241 12 THE ELECTRIC TELEGRAPH. represent the letter I, but two dots sepaiauJ by a space equal intime to two dots represent O. Tlie former is a mere interval, thelatter is called the letter space; the word and sentence space aremultiples of it — usually twice for the former and thrice for thelatter.…
Electrical engineering
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