ARTIFACT WORKSHEET

OH NO.: OH0845.022

Worksheet completed by: Suzanne Beauvais Collector: Anna Adamek

Group: Énergie électrique/Electric Energy Category: mesurage/measurement

Article: ammeter/ampèremètre

Type: DC/railroad/switchboard/0-1000

Model: pattern No. 31

Serial number: 3001 (écrit à la main)Manufacturer: Jewell Electrical Instrument Company

address: Chicago, IllinoisYear manufactured: 1899 -1928

Distributor:address:

Source: Ontario Hydro

Dimensions: l. w. h. Weight:

Function: Pour mesurer l’intensité d’un courant électrique dans un circuit en ampères

References:http://waywiser.rc.fas.harvard.edu/view/people/asitem/items@null:1383/0?t:state:flow=e472de24-53c6-4fd3-b3ec-8bcb8ba5ecbd

Electrical Engineering Catalogs, 1930/1931, 1930, p. 125.Jewell Electrical Instrument Company, Electrical Measuring Instruments, catalogue no. 16, 1928, en ligne, p. 47-48: https://ia601002.us.archive.org/16/items/ElectricalMeasuringInstruments/Cca50256jewellElectricalInstrumentCo..pdf

http://www.trainweb.org/elso/len.htm

Patent references: Period of use: Area of use: Preston, Ontario

Significance to Canada:Cet instrument aurait servi dans la centrale de production d’électricité à Preston, Ontario,

de la ligne ferroviaire électrique, Lake Erie & Northern Railway. Cette ligne interurbaine électrique desservait Waterloo- Kitchener, Preston, Brantford, Paris, Port Dover et Hespeler. Construite entre 1913-1915 et appartenait à la Canadian Pacific Electric Lines dont le siège social était établi à Preston, Ontario. Il s’agissait d’une ligne pour le transport de passager et de marchandises. Fait partie de la collection Hydro-Ontario. Cette collection acquise par le musée des sciences et de la technologie du Canada en 1992 documente la culture matérielle de l’histoire de l’électricité et ses usages. Avant d’appartenir à la collection OH, cet instrument provenait de M. Heinz Peper (mars 1973), établi alors à Waterloo, Ontario. M. Peper a travaillé dans le domaine de l’électricité, a aussi enseigné l’électricité. Il a aussi été entrepreneur et fut bénévole pour le projet du musée d’Hydro-Ontario. Il a vendu une partie de sa collection à Hydro-Ontario.

La firme avait en 1928 des bureaux de vente à Montréal, Qué., Toronto, Ont., Winnipeg, Man., Vancouver, B.C.

This instrument was used at the Lake Erie & Northern Railway generator station switchboard in Preston, Ontario. This small interurban electric railway serviced Waterloo-Kitchener, Preston, Brantford, Paris, Port Dover and Hespeler. The line was constructed between 1913-1915 and belonged to Canadian Pacific Electric Lines with headquarters located in Preston, Ontario. It was for freight and for passengers.

Part of the Ontario Hydro Collection. This collection was acquired by the CSTM in 1992. It documents the material culture of the history of electricity and its uses. Before, this instrument belonged to Mr. Heinz Peper, living then in Waterloo, Ontario. (sold to OH in March 1973) Mr. Peper worked in the electricity field, and taught also in this field. He was also an entrepreneur and a volunteer for the Ontario-Hydro Museum project. He sold part of his collection to Ontario Hydro.

Significance to technology:

Avec mouvement de style A:

MAGNETS. The permanent magnets used in all of the direct current instruments are of conventional shape and have been carefully designed to have the proper ratio of length to cross section in terms of the required flux and length of air gap in order to obtain an assembly which will be permanent and unvarying. The magnets are forged from the best of alloy magnet steel, and heat treated with equipment which will produce a uniform product. The pole faces are ground to secure a proper fit to the pole pieces, which are machined from a special grade of soft steel.

RUST-PROOFING. All steel parts in Jewell instruments are thoroughly rust-proofed by means of a coating of metallic cadmium, plated in special tanks, to secure an even depth. Tests have shown that cadmium plating is several times better than any other known method for securing a real rust-resisting surface. It was first used in instruments by the Jewell Electrical Instrument Company and its merits are such that practically every commercial instrument made today is rust-proofed by this method.

(Jewell Electrical Instrument Company, Electrical Measuring Instruments, catalogue en ligne, p. 47-48: https://ia601002.us.archive.org/16/items/ElectricalMeasuringInstruments/Cca50256jewellElectricalInstrumentCo..pdf)

Mouvement de type D’Arsonval-aimant permanent et bobine en mouvement : a moving coil swing between first grade sapphires moving in an air gap in which is concentrated a strong magnetic field from a permanent magnet. The moving coil is usually wound on an aluminum frame

L’aiguille est de construction solide et ne plie pas même lors de hautes surcharges.Celui-ci est échelonné jusqu’à 1000 ampères ce qui nécessite l’usage d’un transformateur de courant (range current transformer). Un « shunt » externe doit aussi être utilisé.

Direct current instruments are self-contained up to and including 300 volts or 75 amperes, beyond which range external multipliers or shunts are supplied. Alternating current instruments are made internal up to and including 300 volts. Potential transformers are recommended above 750 volts. Ammeters of this type are self-contained up to and including 500 amperes, above which range current transformers must be used, the instrument scales being marked in terms of primary current

(Jewell Electrical Instrument Company, Electrical Measuring Instruments, catalogue en ligne, p. 47-48: https://ia601002.us.archive.org/16/items/ElectricalMeasuringInstruments/Cca50256jewellElectricalInstrumentCo..pdf)

Full scale= 75 mv 0-1000Scale calibrated for 1000 amps75 mv 1000 amp shunt required

Materials: metal, verre, papierMissing parts: une visCondition : rouille sur la surface du dessous

Markings/inscriptions :3 écrit en blanc sur la surface

Etiquette OH : ….

Sur la face du cadran :

…75 M.V.Comments: La firme a été fondée en 1899 et fut possiblement achetée par Weston en 1928 mais ce fait reste à confirmer.

This company was founded in 1899 and it seems it was bought by Weston Electrical Instruments Corp. in 1928.

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