Polarising helioscopic eyepiece.

Made by Hugo Schroeder in Hamburg, Germany, 1874.

In 1874, after two years of inquiries, 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 he 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 Russe...

Summary

H10380
A polarising helioscopic eyepiece consisting of a central brass disc with a hole in its surface. Set into the surface of the disc surrounding the hole is a rotatable brass scale. Fixed to the rotating scale is a rectangular metal structure set at an oblique angle. Inside the metal structure there is a rectangular glass lens which is held at an angle by two metal brackets. There is an additional pair of brackets for another lens however no lens is present. There is a hole in the top of the oblique metal structure into which a brass screw fitting has been attached. On the underside of the central brass disc is a metal bracket containing two additional rectangular glass lenses. The lenses are set at an angle and held in place by metal brackets.

Dimensions

145 mm

Production

The eyepiece was made in 1874 by Hugo Schroeder in Hamburg Germany.
Hugo Schroeder 1874

History

The eyepiece was used at the Sydney Observatory, Watson Road, Observatory Hill, Sydney, New South Wales, Australia.
Sydney Observatory

Source

Ex Sydney Observatory, 1984
7 September, 1984

Cite this Object

Polarising helioscopic eyepiece. 2016, Museum of Applied Arts & Sciences, accessed 24 July 2017, <https://ma.as/232627>
{{cite web |url=https://ma.as/232627 |title=Polarising helioscopic eyepiece. |author=Museum of Applied Arts & Sciences |access-date=24 July 2017 |publisher=Museum of Applied Arts & Sciences, Australia}}
Know more about this object?
TELL US
Have a question about this object?
ASK US