Drum chronograph, Sydney Observatory

Drum chronograph, Sydney Observatory

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Credit: ROYAL ASTRONOMICAL SOCIETY/SCIENCE PHOTO LIBRARY

Caption: 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.

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Keywords: 1800s, 1900s, 19th century, 20th century, 4-pendulum, astrographic, astronomical, astronomy, australia, australian, black-and-white, clock, cylindrical, device, drum chronograph, drum cylinder, equipment, graphical record, historical, history, instrument, monochrome, paper, pen, pendulum, recorder, recording drum, rotating gear system, sydney, sydney observatory, technological, technology, timing device, timing of astronomical observations

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