There are two main types of telescopes. One uses a curved reflecting mirror to capture an image of the celestial bodies. The other uses a refracting lens to magnify the image.
This 6-inch refracting telescope was made by Sir Howard Grubb of Dublin. It was ordered to observe the Transit of Venus that was expected in December 1882, and it was shipped out of Dublin around July 1882. Unfortunately there were problems with Australian customs and it sat on the dock rather than being used to observe the transit. It was later installed in the North Dome of the Observatory and so was probably used by Lawrence Hargrave.
The order for the telescope included a comprehensive list of pulleys, weights and clamps along with a 4.5-inch guide telescope and micrometers and eyepieces for both the 6-inch and the 4.5-inch. There were only two other Australian orders for six inch Grubb telescopes in the nineteenth century; one went to W. J. Macdonnell at Port Macquarie in the 1870s or 1880s, while the other went to F.D.G. Stanley in Brisbane sometime before 1895.
Geoff Barker, August, 2007
Glass, I. S., Victorian Telescope Makers; the Lives and Letters of Thomas and Howard Grubb, Institute of Physics Publishing, Bristol and Philadelphia, 1997