By attaching a fine point to the end of the bar and moving under this bar at a uniform rate, as it vibrates, a smoke-blackened paper, a sinusoidal curve is traced on the paper.
"Manhood of Humanity."
Alfred Korzybski
It was pointed out in the patent that Bell discovered the great principle that electrical undulations induced by the vibrations of a current produced by sound-waves can be represented graphically by the same sinusoidal curve that expresses the original sound vibrations themselves; or, in other words, that a curve representing sound vibrations will correspond precisely to a curve representing electric impulses produced or generated by those identical sound vibrations-as, for example, when the latter impinge upon a diaphragm acting as an armature of an electromagnet, and which by movement to and fro sets up the electric impulses by induction.
"Edison, His Life and Inventions"
Frank Lewis Dyer and Thomas Commerford Martin
I should have succeeded in the interchange of atoms which we were working on, and Smith would at this moment be hailed as the first man to travel through space in invisible form, projected on radio waves, had it not been for the fact that the alloy which conducts the three types of sinusoidal failed me and burned out.
"Astounding Stories of Super-Science April 1930"
Various