General Information

Serial #

1013

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

BRASS/ WOOD/ GLASS

Dimensions

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

Length

16.6 cm

Width

15.2 cm

Height

7.3 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

Weston

Country

United States of America

State/Province

New Jersey

City

Newark

Context

Country

Canada

State/Province

Quebec

Period

Unknown

Canada

THIS INSTRUMENT WAS USED BY THE DEPARTMENT OF ELECTRICAL ENGINEERING AT MCGILL UNIVERSITY.

Function

Unknown

Technical

PORTABLE INSTRUMENTS CONSTRUCTED TO BE MOVED FROM PLACE TO PLACE FOR TESTING PURPOSES. THEY ARE USED MORE OR LESS OF EXACT MEASUREMENTS & THEREFORE AREDESIGNED FOR GREAT ACCURACY. ANCESTORS OF MOVING COIL INSTRUMENT WERE THE 'SIPHON RECORDER' DEV'D BY WILLIAM THOMSON IN 1867 FOR TELEGRAPH INDUSTRY AND THE 'FISHBONE GALVANOMETER' INVENTED IN 1880 BY MARCEL DEPREZ. JACQUES D'ARSONVAL SUGGESTED FIXING THE 'FISHBONE' IN DEPREZ'S INSTRUMENT & MAKING ITS COIL MOVABLE. MAIN DISADVANTAGE OF D'ARSONVAL AMMETER WAS THAT TO WORK PROPERLY, IT REQUIRED A VERY LIGHT MOUNTED COIL SO AS TO BE READILY MOVEABLE AS SUCH, IT DIDN'T MEET CRITICAL SUCCESS UNTIL TOWARDS END OF 19TH C.

Area Notes

Unknown

Details

Markings

N/A

Missing

COMPLETE

Finish

Unknown

Decoration

N/A