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H10007 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. Click to enlarge.

Filar micrometer made by Hugo Schroeder Hamburg

Made
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

Summary

Object No.

H10007

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 the 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

Cite this Object

Harvard

Filar micrometer made by Hugo Schroeder Hamburg 2020, Museum of Applied Arts & Sciences, accessed 24 November 2020, <https://ma.as/230511>

Wikipedia

{{cite web |url=https://ma.as/230511 |title=Filar micrometer made by Hugo Schroeder Hamburg |author=Museum of Applied Arts & Sciences |access-date=24 November 2020 |publisher=Museum of Applied Arts & Sciences, Australia}}

Incomplete

This object record is currently incomplete. Other information may exist in a non-digital form. The Museum continues to update and add new research to collection records.