Filar micrometer made by Hugo Schroeder Hamburg
Object No. H10007
In 1874, after two years of enquires, the New South Wales 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 Russell purchased some additional instruments from Schroeder for use with the telescope. These were a solar polarising eyepiece (H10380) designed for viewing the sun, some eyepieces (H10294), and this filar micrometer mounted on a graduated circuit. A sun diagonal (H10295) used in conjunction with the Schroeder telescope was purchased separately. This micrometer was primarily used for measuring double star positions. It was still in use in the 1940s when it was worked on by the local instrument maker E Esdaile who replaced the original micrometer. References 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 Geoff Barker, August, 2007
Loading...
Summary
Object Statement
Filar telescope micrometer in storage box with accessories, metal / glass / wood / bakelite, Hugo Schroeder / Harley Wood / E Esdaile, Hamburg, Germany / Sydney, New South Wales, Australia, 1874-1945, used at Sydney Observatory, New South Wales, Australia
Physical Description
Astronomical instrument, filar telescope micrometer in storage box with accessories, metal / glass / wood / Bakelite, used at Sydney Observatory, made by Hugo Schroeder and Harley Wood, Hamburg, Germany and Sydney, New South Wales, Australia, 1874-1945. A micrometer, mounted on a graduated circle with a microscope. The instrument is stored in a wooden box with various accessories including a hand held light source and electrical components. Observatory stock number 5.
PRODUCTION
Notes
According to the object file, the circle and microscope are original, and were made by Hugo Schroeder of Hamburg, Germany. The micrometer was replaced in about 1945, and is attributed to H Wood of Sydney Observatory. The wooden box containing the micrometer was made by E Esdaile, an instrument maker of Sydney, New South Wales, Australia.
SOURCE
Credit Line
Ex Sydney Observatory, 1983
Acquisition Date
1 October 1983
Copyright for the above image is held by the Powerhouse and may be subject to third-party copyright restrictions. Please submit an Image Licensing Enquiry for information regarding reproduction, copyright and fees. Text is released under Attribution-Non Commercial-No Derivative licence.
Image Licensing Enquiry
Object Enquiry