EOST Jardin des Sciences
Université de Strasbourg
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12 - Blum Pendulum


Pendule de Blum

Made in 1973 in Paris.

  • inclinometer constructed on the horizontal pendulum principle
    period 30 s
  • made entirely from melted quartz, pendulum and frame
  • fonctions in a vacuum
  • optical recording by mirror


Pendule de Blum détail

Thanks to the sensitivity of this instrument, we can detect the variation in the dip of an object 1000km (625 miles) away, even if this object has only been lifted up by one millimeter at one of its ends! A Blum pendulum functioned in tunnels in Sainte-Marie-aux-Mines (Haut-Rhin, Alsace).