Capacitor

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OBJECT TYPE
standard
DATE
1959
ARTIFACT NUMBER
2004.0374.004
MANUFACTURER
GENERAL RADIO CO.
MODEL
1409-F
LOCATION
Concord, Massachusetts, United States of America

More Information


General Information

Serial #
18492
Part Number
4
Total Parts
4
AKA
Standard capacitor
Patents
N/A
General Description
metal casing and parts/ synthetic parts

Dimensions

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

Length
10.2 cm
Width
8.3 cm
Height
5.0 cm
Thickness
N/A
Weight
N/A
Diameter
N/A
Volume
N/A

Lexicon

Group
Energy-electric
Category
Measurement
Sub-Category
N/A

Manufacturer

AKA
GENERAL RADIO
Country
United States of America
State/Province
Massachusetts
City
Concord

Context

Country
Canada
State/Province
Ontario
Period
1970's-1980's
Canada
An instrument of a type used by the Meteorological Service of Canada, probably in its calibration laboratories. Part of a large collection of meteorological instruments acquired from the Meteorological Service of Canada (previously Atmospheric Environment Service) by the CSTM since 1967. MSC is the government agency responsible for collecting and disseminating meteorological data and forecasts in Canada. It was founded in 1871 in Toronto where it is still headquartered. The MSC was originally on the University of Toronto downtown campus but moved to Downsview in 1971 on land owned by UofT. The headquarters houses laboratories, research facilities and calibration and instrument maintenance facilities (now largely contracted out).
Function
A device composed of two conducting surfaces separated by a dielectric (in this case mica), which has the ability to store electrical energy and block the flow of direct current; this type served as a fixed standard for laboratory use.
Technical
An example of a standard capacitor used for calibrating instruments. The 1409 standard capacitor first appears in General Radio's 1959 catalogue (Ref. 1). It is a fixed mica capacitor of very high stability for use as two or three terminal reference or working standards in the laboratory. The capacitor consists of a silvered mica and foil pile, spring-held in a heavy metal clamping structure for mechanical stability. The units are housed in , with silica gel to provide continuous dessication, in aluminum cases, sealed with high-temperature potting wax. There is a well in the casing wall for the insertion of a dial thermometer, three jack-top binding posts on the casing top, and removable plugs on the bottom for parallel connection without error. The 1409-F had a nominal capacitance of 0.001 microfarads. The last GR catalogue in the CMST trade literature collection to list the 1409 capacitor was issued in 1972 (Ref. 2). In 2000 IET Labs acquired the GenRad standards, decade box, audio and strobe product lines and in 2007 continued to market, service and support these products, including the 1409 series of standard capacitors (Ref. 3).
Area Notes
Unknown

Details

Markings
white and black lettering on black and grey plate attached to top reads 'STANDARD CAPACITOR/ TYPE 1409-F SERIAL 18492/ 1.0 uF +/-0.05%/ 500V MAX PEAK/ BELOW 750 KC/ SEALED UNIT DO NOT DRILL CASE/ GENERAL RADIO COMPANY/ CONCORD MASSACHUSETTS USA'/ inventory label on underside reads 'ACSL FEB 84/ DS-0136'/ black stamped '194513' on underside/ white label on side with handwritten '305'/ white label on side with handwritten '# 304'
Missing
appears complete
Finish
black painted? casing/ plated parts/ grey and black synthetic/ black feet
Decoration
N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

GENERAL RADIO CO., Capacitor, after 1959, Artifact no. 2004.0374, Ingenium – Canada’s Museums of Science and Innovation, http://collection.ingeniumcanada.org/en/id/2004.0374.004/

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