General Information

Serial #

151

Part Number

1

Total Parts

2

AKA

N/A

Patents

N/A

General Description

Metal casing, recorder parts, parts/ Glass front in metal framed door/ Synthetic controls and parts/ Paper roll

Dimensions

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

Length

48.4 cm

Width

22.5 cm

Height

22.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Astronomy

Category

Research

Sub-Category

N/A

Manufacturer

AKA

Moseley

Country

United States of America

State/Province

California

City

Pasadena

Context

Country

Canada

State/Province

Ontario

Period

mid 1960s +

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

A device which recorded data onto paper, in this case astronomical data.

Technical

An example of accessory equipment used with an astronomical analytical instrument, possibly the Grant Spectrum Line Measuring Comparator (2008.0178). Strip chart recorders were used primarily in industrial applications where there was a need for continuous recording of such data as aircraft testing (wing stress), oil well exploration (seismic logs) and satellite solar converters (voltage output). The Moseley 7101B provided 10-inch strip chart recording capabilities. Each input channel accepted any of the wide variety of input modules, which determined the electrical span or special purpose recording capability. The 7101B had one pen and took one input module (as opposed to two pens and modules for the 7100B). Metric and rack mounting models were also available. The Moseley technology was pioneering in the field of two-axis graphic recording instruments. [Ref. 2]

Area Notes

Unknown

Details

Markings

Indented black and red lettering on reorder front reads 'MOSELEY AUTOGRAPH/ MODEL 7101B CHART RECORDER'/ Plate on back reads 'MODEL 7100B/ OPTIONS 11/ F.L. MOSELEY CO./ 115 VOLTS 60 CYCLES/ PASADENA, CALIFORNIA/ SERIAL NO. 151/ SCHEMATIC D-14513-C'/ White lettering for control functions in interior and on back/ Red and blue applique labels on front read 'CHAN. A' and 'CHAN. B' respectively/ Yellow applique label on back reads 'V'

Missing

Input channel connector on back

Finish

Metallic blue painted casing/ Colourless transparent glass front in brushed metal frame/ Glossy black painted interior casings/ Plated recorder parts/ Black, red and white synthetic controls/ Metallic grey parts/ White paper with green lines

Decoration

Metallic grey casing trim