By Paul. E Sabine

A number of the earliest books, relatively these relationship again to the 1900s and sooner than, are actually tremendous scarce and more and more dear. we're republishing those vintage works in reasonable, top of the range, glossy variations, utilizing the unique textual content and art.

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If at the same time mechanisms that would record we could particle velocity and devise particle acceleration, the traces of these magnitudes on the moving film would be shown as in Fig. 4. The maximum excursion on one side of the undisplaced position, the distance A, is the amplitude of the vibration. The number of complete to-and-fro excursions per second is the frequency/ of vibration. r radians of angular motion, then co Energy of 15 = 2irf Simple Harmonic Motion. It is evident that, in the ideal case we have assumed, r the kinetic energy of the particle P is a maximum at 0, the position of zero displacement and maximum velocity.

The room The current generated in the exploring telephone passed of an Einthoven string dynamomthe silvered fiber through the eter, magnified image of which was focused by means of a magnifying optical system upon a moving film. This film was driven by a shaft geared to the rotating shaft bearing the exploring telephone which also carried a finger that opened a light shutter on to the moving film at each revolution of the vertical shaft, so as to mark the position SUSTAINED SOUND IN AN INCLOSURE 43 f the exploring telephone corresponding to any point on he film.

The total 2 2 2 energy per cubic centimeter is, therefore, 2w pf A of which, on the average, half is potential and half kinetic. The term " intensity of sound" may be used in two ways: either as the energy per unit volume of the medium or as the energy transmitted per second through a unit section perpendicular to the direction of propagation. " We shall denote the energy density by symbol / and the energy flux by symbol If the energy is being transmitted with a velocity of c /. cm. per second, then the energy passing in 1 sec.

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