1 gen 1862 anni - Alexandre-Emile Béguyer de Chancourtois

Descrizione:

The telluric screw plotted the atomic weights of the elements on the outside of a cylinder, so that one complete turn corresponded to an atomic weight increase of 16. As the diagram shows, this arrangement means that certain elements with similar properties appear in a vertical line. Although the telluric screw did not correctly display all the trends that were known at the time, de Chancourtois was the first to use a periodic arrangement of all of the known elements, showing that similar elements appear at periodic atom weights.

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