» Vibrating Microscope with five tuning Forks (0359)

Immagini

DESCRIPTION

Exhibit 359 is a vibrational microscope or optical comparator, used to analyze the vibrations of objects. It is composed of two cast iron bases, one with a microscope and eye piece and a tuning fork, the other with a tuning fork in such a way that between the two arms there is an electromagnet activated by continuous current. Each tuning fork has a metal reflecting disk attached to an arm.

In operation, the tuning fork with the microscope (A) is placed vertically and the auxiliary tuning fork (B) is placed horizontally. A light beam from source S is directed through a focusing lens (L), then reflected from the disk on B and then from the disk on A and finally on the reticule in the eyepiece of the microscope. If only tuning fork A vibrates, one sees a vertical line in the eyepiece. If both vibrate, one sees a Lissajous figure in the eyepiece. By studying the Lissajous figure and knowing the frequency of A one can determine the frequency of vibration of B. The exhibit has available 5 tuning forks of type B.

ISCRIZIONI

Su due targhette incollate a ciascuno dei supporti c'è il nome del costruttore: "Max Kohl Chemnitz 1/8".

BIBLIOGRAPHY

[1] WORSNOP B.L., FLINT H.T., "Advanced practical Physics for students", Asia Publishing House, New Delhi, India. Ed. 1961. Pag. 442 (The Vibration Microscope)

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