In 1874, after two years of enquires, the NSW Government Astronomer H. C. Russell acquired a number of new instruments in preparation for the upcoming Transit of Venus. One of these was a new 11.4 inch telescope (H9886) purchased for the observation of double stars from the optician and instrument maker, Hugo Schroeder.
In 1870 Schroeder had made an objective for the Hamburg Observatory and the success of this instrument may have been one reason Russell sought him out. As well as the telescope Russell purchased some additional instruments from Schroeder for use with the telescope. These were a solar polarising eyepiece (H10380) designed for viewing the sun, a filar micrometer mounted on a graduated circuit (H10007) and these eyepieces. A sun diagonal (H10295) used in conjunction with the Schroeder telescope was purchased separately.
These quality eyepieces made by Carl Zeiss of Jena, were used with the 11.4-inch telescope but it is uncertain as to whether they were purchased at the same time. The fact the Zeiss lenses are all contained in a wooden box with Scroeder's name plate on it implies this may have been the case. The quality of these eyepieces was commented on by Russell who felt that the definition of the telescope was superb especially when using the achromatic eyepieces supplied by Dr. Schroeder.
Haynes, Raymond, Haynes, Roslynn, Malin, David, McGee, Richard, Explorers of the Southern Sky, Cambridge University Press, 1996
Russell, H., C., "Report of Astronomer for 1874 & 1875', New South Wales Government Printer, 1876
Auerbach, F., The Zeiss Works and the Carl Zeiss Foundation in Jena, W. & G., Foyle, London, England, about 1925?
Geoff Barker, August, 2007