Immagini

DESCRIPTION

Exhibit 779 is a metallic parabola in which the internal surface has been polished to become a mirror. It is mounted on a wood column which rests on a tripod. This apparatus can be used alone or with a similar parabola to demonstrate reflection of thermal radiation (a) or acoustic waves. (b)

a) To demonstrate reflection of thermal radiation, place at the focus of one parabola a match head and at the focus of the other a lighted cancle. (See design-1).

b) To demonstrate reflection of acoustic waves, place a ticking clock at the focus of one and a funnel attached to a flexible tube at the other. The ticking sound should then be audible at the opposite end of the tube (See design-2)

This mirror was acquired together with exhibit 780

BIBLIOGRAPHY

• [1] A. Priva-Deschanel,"Trattato Elementare di Fisica", Fratelli Dumolard, Milano, 1882. Pag. 787.
• [2] A. Gnot,"Trattato Elementare di Fisica Sperimentale", Milano,1861, pag.233.

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