Powerhouse Museum Collection Search 2.53
Category history:

Some users have reported searches being slow to complete.
Please be aware we are working to rectify this.

   

Support the Powerhouse with a tax-deductible gift

Make a donation
This object belongs to
Theme containing this object
Astronomy Equipment > Telescopes

+ 2010/1/3 Telescope, gun sighting, Naval,...
+ 2010/1/7 Telescopes, bearing (2), No.10,...
+ 85/142 Telescope, four inch...
+ 85/502 Telescope, terrestial (brought to...
+ 2005/134/1 Telescope, reflecting, and ca...
+ H3800 Target telesope and tripod (LC)....
+ 2008/12/1 Telescope, Newtonian reflector...
+ 2008/19/1 Astronomical equipment, 13-inc...
+ 89/1362 Telescope, double beam, Boller a...
+ 89/1365 Telescope, stereoscopic, metal/g...
+ 2009/65/1 Telescope, reproduction of Gal...
+ H7162 Surveyor's telescope.(SB)....
+ H7217 Telescope, wood / brass / glass, u...
+ H7227 Navigating instrument, ships teles...
+ H7280 Telescope, brass & wood, Fleming, ...
+ H7464 Collection of optical plastics as ...
+ H7516 Telescope (student's transit). Len...
+ H7542 Telescope, astronomical, on brass ...
+ H8084 Telescope, Zenith, Dollond transit...
+ H8719 Telescope, refractor, brass, Great...
+ H8886 Telescope, Mariners; black leather...
+ H8887 Instruments: sextant, telescopes e...
+ H9395 Telescope, refractor, brass, c. 18...
+ H9463 Watch officer telescope, for marit...
+ H9547 Telescope, Refracting, Great Brita...
+ H9820 Telescope, and accessories, equato...
+ H9886 Telescope, 11.4 inch equatorial re...
+ H9887 Telescope, 6-inch equatorial refra...
+ H9888 Telescope, 3 1/4 inch refracting t...
+ H9891 Telescope, 3 3/4 inch transit tele...
+ H9899 Telescope, 6 inch refracting trans...
+ H9975 Telescope, 3 1/4" refractor with a...
+ H10256 Telescope and tripod, 2" refracto...
+ H10307 Telescope, zenith-sector telescop...
+ H10360 Telescope-gears and casting patte...
+ H10374 Guiding telescope with Merz lens,...
+ 87/100 Exploration outfit, telescope wit...
+ 94/202/1 Telescope, with carrying case, ...
+ B1359 Surveyor's instrument. Telescope, ...
+ B1747 Artillery telescope. Telescope Dir...
+ B2514 Telescope, silver / glass / leathe...


Astronomy Equipment > Optical instruments

+ 2010/1/184 Optical calibration device wi...
+ 2008/83/1 Stereo-plotting machine, Wild ...
+ 2008/128/1 Optical flat, with case, glas...
+ 2008/128/2 Optical flat, with case, glas...
+ H7464 Collection of optical plastics as ...
+ H9975 Telescope, 3 1/4" refractor with a...
+ H10025 Astronomical equipment, sun diago...
+ H10026 Optical equipment, polarizing eye...
+ H10031 Spectroscope, McClean type, in ca...
+ H10032 Spectroscope eyepiece in storage ...
+ H10033 Optical equipment in storage box,...
+ H10060 Microscope plate reader in case, ...
+ H10063 Measuring instrument, scaleometer...
+ H10066 Optical instrument, for measureme...
+ H10139 Optical instrument, for measureme...
+ H10140 Optical instrument, for measureme...
+ H10183 Optical instrument, for measureme...
+ H10256 Telescope and tripod, 2" refracto...
+ H10272 Reseau in case, glass / metal / l...



3 3/6" refractor telescope., 1870 - 1880
zoom image

Object statement
Astronomical equipment, telescope, 3 3/6" refractor, metal / glass, maker unknown, used at Sydney Observatory, Sydney, Australia, 1874-1890
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. Refracting telescopes were the first type of telescopes to be invented, appearing in around 1608.

This telescope was likely used as a finder telescope on the Observatory's 11.4 inch refractor telescope (H9886). Finder telescopes are generally smaller instruments of low power and large field of view that attach to a larger more powerful telescope, such as H9886. They allow an observer to find a celestial object more readily, then swap to the larger telescope for more detail. The telescope was fitted with a camera and enlarging lens that magnified the Sun's image to four inches

In 1874, after two years of enquiries, 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 refractor telescope (H9886), purchased for the observation of double stars from the optician and instrument maker, Hugo Schroeder.

The 11.4 inch telescope was specially made to fit into Sydney Observatory's South Dome. The original dome built in 1858 was taken down and a larger dome built to fit the telescope. The telescope had a clear aperture of 11.4-inches and a focal length 12 feet 6 inches and Russell commented that while this shortened focal length was a disadvantage to definition it was an advantage to its light catching power.

The telescope was adapted for taking photographs of the Transit of Venus in December of 1874. For the Transit of Venus it was fitted with a camera and enlarging lens that magnified the suns image to four inches. The wet collodion photographic plates were placed at the end of the camera and held in place by a spring. The camera end passed into a dark room tent raised inside the dome and connected to the telescope by a flexible sleeve. A shutter was used to take the picture which was developed on the spot and another inserted immediately. Three persons working in this fashion managed to take one photo per minute. The telescope was also used by Russell on the 7th of May 1879 to measure the 'Gem' star clusters in Arago.

Geoff Barker, Assistant Curator, August, 2007

References
Todd, David, P., Stars and Telescopes, Sampson Low, Marston, and Co., 1900
Haynes, Raymond, Haynes, Roslynn, Malin, David, McGee, Richard, Explorers of the Southern Sky, Cambridge University Press, 1996
Airy, G. B, Account of the Observation of the Transit of Venus, 1874, December 8, Made Under the Authority of the British Government and of the reduction of the Observations, Her Majesty's Stationary Office, 1881
De-Clerq, P.R., Nineteenth Century Instruments and their Makers; Rodopi, Amsterdam, 1985
Knight, E., H., (ed), 'Knights American Mechanical Dictionary', Vol III, J.B. Ford and Company, New York, 1874
H√ľnsch, Matthias, Hamburg Observatory - Overview: Buildings & Telescope, http://www.hs.uni-hamburg.de/EN/Oef/Stw/aequator/aequator.html
McConnell, A., Instrument Makers to the World; a History of Cooke, Troughton and Simms, William Sessions, York, England, 1992
Russell, H., C., "Report of Astronomer for 1874 & 1875', New South Wales Government Printer, 1876
The telescope is believed to have been made c. 1875.
Used at Sydney Observatory as a finder telescope on 11.4 inch refractor telescope (H9886).

The date range given for use by Sydney Observatory is based on the year of installation of the 29 cm telescope, 1874, until the time of building the astrograph in 1890.

 This text content licensed under CC BY-NC.

Description
Astronomical equipment, telescope, 3 3/6" refractor, metal / glass, maker unknown, used at Sydney Observatory, Sydney, Australia, 1874-1890

A 3 3/6" refractor telescope with a tube made from metal. The tube is dented in places and has two screw holes in one side of it. Two screws with washers fit into the screw holes. There is a lens with a brass surround in one end of the tube and a brass eyepiece at the opposite end. The eyepiece can be unscrewed into three pieces, an eyepiece, an aperture, and a lens.

Made: 1870 - 1880


Used: Sydney Observatory; Sydney; 1870 - 1879
H10257
Production date
1870 - 1880
Diameter
95 mm

 This text content licensed under CC BY-SA.
This object belongs to:
Sydney Observatory Collection
Subjects
+ Astronomy
+ Scientific equipment
+ Sydney Observatory
+ Optics
Short persistent URL
Concise link back to this object: http://from.ph/231967
Cite this object in Wikipedia
Copy and paste this wiki-markup:

{{cite web |url=http://from.ph/231967 |title=3 3/6" refractor telescope. |author=Powerhouse Museum |accessdate=24 October 2014 |publisher=Powerhouse Museum, Australia}}


Copyright
Images on this site are reproduced for the purposes of research and study only. Whilst every effort has been made to trace the Copyright holders, we would be grateful for any information concerning Copyright of the images and we will withdraw them immediately on Copyright holder's request.
Object viewed 5567 times. Parent IRN: 2143. Master IRN: 2143 Img: 146669 Flv: H:1134px W:3409px SMO:0 RIGHTS:.