Licht, Waerme, Strahlen / Magnetismus, Elektrizitaet, Induktion / Daemonen und Geister

Licht, Waerme, Strahlen / Magnetismus, Elektrizitaet, Induktion / Daemonen und Geister

Dilatometer
Device for demonstrating thermal dilatation, around 1904

A brass rod is heated with a flame, expanding by approximately 0.0018 percent per degree of temperature increase. A mechanism confers its change in length to the pointer of a measuring instrument.

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