History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 95
Fig. 35. a helical spring attached to the under side of the lever compelsit, by its elasticity, to separate itself from the electro-magnet,when the current ceases to act, \vhich*causes the point no longerto press. The other part of the apparatus is intended to cause a … Fig. 36. long band of paper to pass under the point with a uniform ve-locity, which paper is rolled upon a cylinder (Fig. 36), or, as is THE MORSE SYSTEM. 77 generally the case in the telegraph offices, it is put into a longnarrow box, and after passing through the instrument, or register,passes…
Telegraph
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