Drum chronograph,Sydney Observatory

Numéro d’image : 11637127
Drum chronograph,Sydney Observatory
Drum chronograph,Sydney Observatory,Sydney,Australia. This observatory was established in 1858. This is a 4-pendulum drum chronograph,with the four pendulums at right and a cylinder of recording paper at left. The pendulums and rotating gear system (lower left) ensure a steady rotation that can be adjusted to a faster or slower rate. A pen (centre left) traces a mark on the paper wrapped around the cylinder,providing a graphical record for events and the time at which they occurred. This device would have been used with a transit instrument to record the timing of astronomical observations
Licence : Droits gérés
Crédit: Science Photo Library / Royal Astronomical Society
Taille de l’image : 4572 px × 3845 px
Model Release : Non requis
Property Release : Non requis
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