. The principles of physics. COMPOSITION OF SONOROUS VIBRATIONS AND THEIR RESULTANTWAVE-FORMS. 178. Coexistence and superposition of waves. — Interference.— When two or more currents of waves traverse the samemedium at the same time and in the same direction, so thatone set of waves is, as it were, superposed upon another, thereare imparted to every particle of the medium simultaneouslyall the vibratory motions peculiar to the several waves. Whentwo or more systems of waves act on a particle at the sametime, they are said to interfere. The resultant motion of anyparticle at a given instant wou
. The principles of physics. COMPOSITION OF SONOROUS VIBRATIONS AND THEIR RESULTANTWAVE-FORMS. 178. Coexistence and superposition of waves. — Interference.— When two or more currents of waves traverse the samemedium at the same time and in the same direction, so thatone set of waves is, as it were, superposed upon another, thereare imparted to every particle of the medium simultaneouslyall the vibratory motions peculiar to the several waves. Whentwo or more systems of waves act on a particle at the sametime, they are said to interfere. The resultant motion of anyparticle at a given instant would be found on the principle ofparallelogram of motions ; or, in case the several motions areparallel and occur in the same time, the resultant is thealgebraic sum of the several motions. This will be bestunderstood by means of graphical representations. In A(Fig. 173) are represented by dotted lines the wave lines oftwo coexisting currents of waves having the same wave-length COEXISTENCE AND SUPBKPOSITION OP WAVES. 216.
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