Physics – History and Philosophy of Physics
Scientific paper
2006-10-23
Granular Matter 9, 141-144 (2007)
Physics
History and Philosophy of Physics
4 pages, accepted for publication in Granular Matter, original article (German) can be found under http://www.phy.duke.edu/~ms
Scientific paper
10.1007/s10035-006-0027-x
In a remarkable paper from 1852, Gotthilf Heinrich Ludwig Hagen measured and explained two fundamental aspects of granular matter: The first effect is the saturation of pressure with depth in a static granular system confined by silo walls -- generally known as the Janssen effect. The second part of his paper describes the dynamics observed during the flow out of the container -- today often called the Beverloo law -- and forms the foundation of the hourglass theory. The following is a translation of the original German paper from 1852.
Sperl Matthias
Tighe Brian P.
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