Trebel, George. [from old catalog] · New York, F. Tousey · leaf 58
ut if he presses upon the key long enough to count threethe point of the style will remain in contact with the paper thesame length of time, and as the paper is drawn along beneaththe point a short, straight line is produced. This short line is called a dash. These dots and dashes con-stitute the… … the lens is drawn up by the spiral spring it strikes a screwpoint above, and another tick or click, differing slightly insound from the first, is heard. A listener is able to distinguishdots from dashes by the length of the intervals of time thatelapse between these two sounds. Operators generally…
Electricity
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