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In a remarkable paper from 1852, Gotthilf Heinrich Ludwig Hagen measured andexplained two fundamental aspects of granular matter: The first effect is thesaturation of pressure with depth in a static granular system confined by silowalls -- generally known as the Janssen effect. The second part of his paperdescribes the dynamics observed during the flow out of the container -- todayoften called the Beverloo law -- and forms the foundation of the hourglasstheory. The following is a translation of the original German paper from 1852.

Pressure and motion of dry sand: translation of Hagen’s paper from 1852