. Elements of acoustical engineering. Electro-acoustics; Sound. /<r^ m" ^ m i /\I6. 1000 ru 20000., 4000 7000'o . Fig. The directional characteristics of a group of exponential horns, with a constant flare and throat diameter of f inches as a function of the mouth diameter. The number at the right of each polar diagram indicates the diameter of a circular piston which will yield the same directional characteristic. The polar graph depicts the pressure, at a fixed dis- tance, as a function of the angle. The pressure for the angle 0° is arbitrarily chosen as unity. The direct
. Elements of acoustical engineering. Electro-acoustics; Sound. /<r^ m" ^ m i /\I6. 1000 ru 20000., 4000 7000'o . Fig. The directional characteristics of a group of exponential horns, with a constant flare and throat diameter of f inches as a function of the mouth diameter. The number at the right of each polar diagram indicates the diameter of a circular piston which will yield the same directional characteristic. The polar graph depicts the pressure, at a fixed dis- tance, as a function of the angle. The pressure for the angle 0° is arbitrarily chosen as unity. The direction corresponding to 0° is the axis of the horn. The directional characteristics in three dimensions are surfaces of revolution about the horn Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Olson, Harry Ferdinand, 1901-. New York, D. Van Nostrand company, inc.
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