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I. §12.] CONSTRUCTION OF WAVE-FORM.
each one-sixteenth of a second : 16 coincides with 0, as the particle has returned to its starting-point.
Next, select a series of particles originally at rest in equidistant positions along the initial line, and so situated that each commences a vibration identical with that above laid down in Fig. 11 one-sixteenth of a second after the particle to the left of it has started on an equal vibration. Fig. 12 shows the rest-positions of the series of particles
in the initial line, and their contemporaneous positions
during a subsequent vibration.
The moment selected for the figure is that in which the first of the series, a0, is on the point of moving vertically upwards out of the initial line.