General Information

Serial #

13374-86

Part Number

1

Total Parts

4

AKA

N/A

Patents

N/A

General Description

Metal body and parts/ Synthetic control handle and parts/ Glass optical elements

Dimensions

Note: These reflect the general size for storage and are not necessarily representative of the object's true dimensions.

Length

43.0 cm

Width

41.0 cm

Height

75.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Light & electromagnetic radiation

Sub-Category

N/A

Manufacturer

AKA

Unknown

Country

Canada

State/Province

Ontario

City

Richmond Hill

Context

Country

Canada

State/Province

Ontario

Period

Unknown

Canada

An instrument used at the David Dunlap Observatory at the University of Toronto, one of Canada's most important astronomical observatories. The David Dunlap Observatory opened in 1935 as the result of a bequest from the wife of David Dunlap. The telescope was a 74 inch (188 cm) reflector built by Grubb Parsons of Newcastle-upon-Tyne in England. The 74 inch was then the largest telescope in Canada (surpassing the 72 inch telescope of the Dominion Astrophysical Observatory in Victoria) and became the second largest in the world after the 100 inch Hooker Telescope of the Mt. Wilson Observatory outside Los Angeles. DDO's reputation grew and following WWII, it began to graduate most of the astronomers produced in Canada with University of Western Ontario far behind. Beginning in the 1960s a number of other astronomy departments were created but UofT/DDO held its place, a position it probably still holds. The DDO had a good technical staff which gave them an advantage and, with most of the 1940s to early 1970s top astronomers coming from UofT, grants from NRC and then ENSERC were almost guaranteed and allowed UofT's top astronomers -- Hogg, van den Berg, Fernie, Bolton, Kamper, Martin, etc. to acquire or build some of the best equipment available in university observatories. For optical observatories, only the DAO had technical staff and budgets that surpassed those of DDO. In 2007, citing increasing light pollution, the University of Toronto announced plans to sell the Observatory property. In June 2008, it was sold to Corsica Development Inc., a subsidiary of Metrus Development Inc. and the Observatory was closed. In 2009 the Observatory buildings and 80% of the site were designated a cultural heritage landscape. Also in 2009 Corsica and the Royal Astronomical Society of Canada, Toronto Centre announced an agreement allowing the RASC to provide public education and outreach programs at the observatory, and to operate the 188 cm telescope.

Function

An instrument used in an astronomical observatory to measure the brightness of stars, galaxies and other astronomical bodies with great accuracy

Technical

One of Don Fernie's last two photometers (.1 and .2-.3). The instruments were simultaneously used on the 19 inch and 24 inch telescopes at DDO. The body and filter assemblies were built at DDO. They come with off the shelf components including a PM Tube refrigerator unit made by Products for Research, and EG & G preamplifiers.

Area Notes

Unknown

Details

Markings

Black and silver label inside photomultiplier tube housing cover reads 'PHOTOMULTIPLIER/ TUBE SOCKET/ PRODUCTS FOR RESEARCH, INC./ DANVERS [logo] MASS/ Made in U.S.A./ 9658/441/ 5117-77-1/ RF-TSA/ CATHODE ANODE'/ Label on refrigerated chamber reads 'Refrigerated Chamber/ MODEL TE-206TSRF/ Ser. No. 13374-86/ / PRODUCTS FOR RESEARCH, INC./ 88 Holten St., Danvers, MA 01923/ MADE IN U.S.A.'/ Two black and silver labels on photomultiplier tube housing read 'Photomultiplier Tube Housing/ PRODUCTS FOR RESEARCH, INC./ MADE IN U.S.A./ White label on photomultiplier tube housing reads 'Model# JOB16554' and '/ PRODUCTS FOR RESEARCH, INC./ 88 Holten St., Danvers, MA 01923/ MADE IN U.S.A.'/ Label on eyepiece counter reads 'EDSCORP/ 8.4mm - 21mm'/ Plate on preamplifier reads '[logo] EG&G PARC/ MOD 1120 SER 27112'/ Lettering on photon counter casing reads 'EG&G PRINCETON APPLIED RESEARCH/ PHOTON COUNTER/ MODEL 1120/ AMPLIFIER-DISCRIMINAT…'/ Handwritten '19" ' and '7/7/95' on casing, with handwritten paper label reading 'JULY 13/85/ PYREX WINDOW'/ Yellow label on casing reads '19'

Missing

Unknown

Finish

Glossy black painted cylindrical casing/ Brushed metal rectangular casing for refrigerated chamber and photomultiplier tube housing with textured black painted cover for photomultiplier tube socket/ Light grey painted preamplifier casing/ Black painted, plated and metallic parts/ Black synthetic cord covering/ Black and white synthetic parts

Decoration

N/A