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Hourglass of constant weight

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Abstract

In contrast to a still common belief, a steadily flowing hourglass changes its weight over the course of time (Shen and Scott in Am J Phys 53(8):787–788, 1985). We will show that, nevertheless, it is possible to construct hourglasses that do not change their weight.

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References

  1. Shen K.Y. and Scott B.L. (1985). The hourglass problem. Am. J. Phys. 53(8): 787–788

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  2. (1972). Handbook of Mathematical Functions. Dover, New York

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Authors and Affiliations

  1. Max Planck Institute for Dynamics of Complex Technical Systems, Sandtorstraße 1, 39106, Magdeburg, Germany

    Volker Becker

  2. Physikalisches Institut, Universität Bayreuth, 95440, Bayreuth, Germany

    Thorsten Pöschel

Authors
  1. Volker Becker
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  2. Thorsten Pöschel
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Correspondence to Thorsten Pöschel.

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Becker, V., Pöschel, T. Hourglass of constant weight. Granular Matter 10, 231–232 (2008). https://doi.org/10.1007/s10035-007-0081-z

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  • DOI: https://doi.org/10.1007/s10035-007-0081-z

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