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Chronograph - Melbourne Observatory, 1870s Object Reg. No: ST 038319

Summary:
Chronograph from Melbourne Observatory, designed by Government Astronomer Robert Ellery and built at the observatory workshop in the 1860s or 1870s.

This was one of several chronographs used to record the transits of stars or other heavenly bodies. When the observer on the transit instrument depressed a button to indicate that the star had crossed the transit lines, an electrical impulse to an electronmagnet moved the pen to one side, leaving a mark at the exact time that the star crossed the meridian. The speed of rotation of the drum is accurately controlled by the centrifugal governor.
Acquisition Information:
Transfer from Melbourne Observatory, 1945
Discipline: Technology
Dimensions: 65 cm (Height), 40 cm (Width), 80 cm (Length)

More information

Tagged with: astronomy, chronographs
Themes this item is part of: Melbourne Observatory Collection, Science & Measurement Collection, Great Melbourne Telescope, Robert Lewis John Ellery, Astronomer & Scientist (1827-1908), Positional Astronomy at Melbourne Observatory, Positional Astronomy at Melbourne Observatory, Weights & Measures at Melbourne Observatory, Melbourne Observatory & Standard Time in Victoria, Mapping the Stars at Melbourne Observatory, Astrographic Catalogue, Transits of Venus, 1874 & 1882, Buildings at Melbourne Observatory, Star Observations & Personal Equation, Meteorology at Melbourne Observatory, 1863-1908, Meteorology at Melbourne Observatory, 1863-1908, Williamstown Observatory, 1853-1863, Melbourne Observatory, 1863-1944, Melbourne Observatory, 1863-1944, Geodetic Survey of Victoria, 1858-1872, Geodetic Survey of Victoria, 1858-1872
Primary Classification: ASTRONOMY
Secondary Classification: Research
Tertiary Classification: observational instruments
Designer: Mr Robert Ellery, South Yarra, Victoria, Australia
User: Melbourne Observatory, South Yarra, Victoria, Australia, 1870-1880

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