Usage: improving clarity and effectiveness of the demonstration of the amplitude and phase relationships at resonance. The inventive device comprises a vibrator in the form of a balanced elektrokamertona embodied in a stand installed on a wooden bench, a resonator in the form fixed on the same bench iron string with adjustable tension, forced vibration which are excited due to communication with the vibrator through pedestal base and bench, and remote monitoring screen. With the device is carried out optical mixing oscillations of the driving force of the vibrator with the forced oscillation of the resonator (string) by high-aperture lens fixedly mounted on a shaker. At this point light source is brightly lighted small hole lightweight opaque small screen, with the middle portion sealed by the strings, and the introduction of the projecting lens along with the function of mixing the oscillation ensures high aperture device allowing the achieved high illumination pattern at its large size. Zyl. ww E
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