Immagini

DESCRIPTION

Exhibit 403 is a two channel oscilloscope conserved in a wood case and consisting of two channels, A and B, that must be placed between the poles of the magnet in exhibit 117 according to the scheme in the design.

Each channel consists of a thin wire ss in the form of a U, that passes on a pulley P, connected to a spring to maintain tension. The two ends of each wire are soldered to terminals. Between the two wires there is a small mirror M. Design-1 shows the essential characteristics.

When a current flows in the two branches of wire ss, they are deflected in opposite directions rotating the mirror in one sense. Upon inverting the direction of the current flow, the mirror rotates in the opposite sense.

The observed image of a light source reflected by the mirror on a screen or on a Poggendorf scale will have the aspect of a line.

Using alternating current, the small mirror oscillates on condition that the natural frequency of the wire ss be small in comparison with that of the alternating current. To increase the natural frequency of the mirror support, one can increase the tension in the screw V.

BIBLIOGRAPHY

• [1] Worsnop B. L., Flint H.T., 'Advanced Practical Physics for Students' Asia Publishing House New Delhi, 1961. Pagina 526
• [2] E. Perucca, "Guida Pratica per Esperienze Didattiche di Fisica Sperimentale", Zanichelli, Bologna, 1937.

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