Text: "The only operative appliances to be seen are certain resonating arrangements, and the mystery remains deep how these can yield force. These consist of an arrangement of slender rods or tongues of metal, which successively decrease in length, and which evidently are set to sound different notes of the scale, and of a spirally-curved bugle-shaped appliance. In addition to these a tuning-fork is employed by Mr. Keely when ready to set his machinery in motion. Thus, so far as is visible, the inventor's apparatus are in accordance with his theory of utilizing the vibratory energies of nature." Apergy, Power Without Cost. by CHARLES MORRIS, New Science Review, vol. II, October, 1895 A few definitions ATTENTUATION: 1) The input-to-output reduction imposed by the filter upon an input signal. 2) When amplitude is changed by combining two or more waves or cycles of different amplitudes. ATTENUATOR: Controls amount of signal passing through it.

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