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Updated: June 6, 2025
Let us suppose, in fact, that the current which is traversing the spirals of the helix, r, has a direction such that the helix in its movement approaches the pole, S; then the prolongation, v, will uncover the slit, a, which, along with a', had up to this moment been closed, and a luminous fascicle escaping through a will strike the lens, l', and from thence converge upon the selenium plates, z'. This is all the duty that the line current has to perform.
The ink-eraser, with an absurd little whisk attached to it for brushing away fragments of rubbed paper; the fascicle of sharpened pencils held together by an elastic band; the tiny phial of typewriter oil; a small box of peppermints; a crumpled handkerchief; the stenographic notebook with a pencil inserted at the blank page, so as to be ready for instant service the next day; the long paper-cutter for slitting envelopes; her memorandum pad, on which was written Remind Mr.
By revolving the mirror 90° around its horizontal axis the fascicle becomes horizontal, and may thus be thrown in a given direction at unequal intervals and during irregular times, and furnish conventional signs. Night Communication upon the Entire Horizon.
When it is desired to correspond to a short distance of 2 or 3 miles, and establish a communication between two isolated posts, the mirror, A, is put in place upon its support, B. The luminous fascicle emanating from the source reflected by the mirror is thrown vertically.
The prolongation, v, of the helix, being firmly united with the latter, follows it in its motion, and has the effect of permitting the luminous rays to escape through one or the other of the slits, a a', so that the freeing of the luminous fascicle, if such an expression is allowable, is effected.
The foliage is short and rigid, two leaves in a fascicle, arranged in comparatively long, cylindrical tassels at the ends of the tough, up-curving branchlets.
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