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National Museum staff Ian Stewart and Colin Ogilvie (left and centre) and volunteer Hermann Wehner work on the telescope in the Museum's conservation lab 2009. - click to view larger image
National Museum staff Ian Stewart and Colin Ogilvie (left and centre) and volunteer Hermann Wehner work on the telescope in the Museum's conservation lab in 2009

Amateur astronomer William John Macdonnell purchased this telescope from Thomas Grubb's Astronomical Instrument Works in Dublin, Ireland, in about 1885.

Macdonnell imported the telescope to Port Macquarie in New South Wales. There he installed it in a purpose-built observatory behind the Bank of New South Wales, where he worked as manager, and turned it to the heavens.

Macdonnell used the telescope in a range of observing programs, focusing on transit events, comets, sunspots, double stars and the features of the planets. He was forced to sell the instrument during the financial crisis of the 1890s.

The telescope then passed through the hands of a number of Australia's amateur astronomers.

The Sydney architect EH Beattie used it extensively from 1906, publishing many scientific papers based on his observations. By 1921, however, the telescope had been dismantled and placed in storage, where it remained for most of the next 85 years.

The Museum acquired the telescope in 2005 and has returned it to working condition, as it would have appeared in the late 19th century.

A man wearing a suit and hat stands beside a timber observatory building. The door and the roof of the circular structure are open, revealing a telescope inside.
WJ Macdonnell outside his 'bank observatory', built to house the Grubb telescope, at Port Macquarie, about 1885

Six-inch Grubb refractor

This telescope is a refracting type, using an objective (comprising two lenses) of around six inches (15 centimetres) diameter to form an image of the object under observation. It is equatorially mounted, meaning that its main axis is parallel to the Earth's axis of rotation. This enables it to be set to follow the stars as they appear to move across the sky.

Engineering innovation

In the 1880s this telescope was a cutting-edge scientific instrument incorporating innovative features such as the capacity to keep sidereal, or star, time as it tracked an object through the sky.

This meant that an astronomer could move the telescope to observe one star or planet after another without having to stop each time to complete time-consuming calculations locating the celestial bodies.

In our collection

1883 Grubb Refractor Telescope1883 Grubb Refractor Telescope with associated parts and attachments. The telescope has a tapering cast iron base in two parts. The polar axis assembly is made from cast iron and brass, and comes with three separate disc weights. The declination access assembly is made from cast iron and steel and comes with a cylindrical weigh...

The ‘spirit of inquiry’ in Port Macquarie

Curator and historian Roslyn Russell talks about the work of amateur scientists, including astronomer WJ Macdonnell, in the New South Wales coastal town of Port Macquarie, as part of her research for the Creating a Country gallery.
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