General Information

Serial #

449 (450 & 452)

Part Number

1

Total Parts

15

AKA

N/A

Patents

N/A

General Description

BOX OF WOOD WITH SILK AND VELVET LINING WITH METAL HARDWARE/ KNOBBED WEIGHTS, BRASS/ FLAT WEIGHTS, METAL/ PANS, ROD, & RIDERS - ALUMINUM

Dimensions

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

Length

17.0 cm

Width

11.0 cm

Height

6.0 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Metrology

Category

Mass/weight

Sub-Category

N/A

Manufacturer

AKA

Unknown

Country

Unknown

State/Province

Unknown

City

Unknown

Context

Country

Canada

State/Province

Unknown

Period

PROBABLY USED IN THE EARLY PART OF THE 20TH C

Canada

TYPE SAMPLE

Function

USED WITH AN ELECTRIC BALANCE TO DETERMINE THE VALUE OF ELECTRIC CURRENT IN AMPERES, BALANCE IS RESTORED TO THE BEAMS WHEN AN ELECTRIC CURRENT PASSES THROUGHT THE COILS BY SLIDING THE WEIGHTS ALONG A GRADUATED SCALE ON THE BEAM FROM WHICH THE CURRENNT CAN BE READ IN AMPERES.

Technical

THESE WEIGHTS ARE MEANT TO BE USED WITH A KELVIN TYPE ELECTRICAL BALANCE, KELVIN DEVELOPED A COMMERCIAL INSTRUMENT BASED ON LORD RAYLEIGH'SCURRENT BALANCE OF 1883 [REF 1]

Area Notes

Unknown

Details

Markings

PLATE ON TOP OF BOX: 'WEIGHT BOX FOR ELECTRIC BALANCE/ 449'/ STAMPED ON WEIGHTS:.1 '25/ AMP/ 452'/.2 '100 AMP./ 449'/.3 '75/ AMP./ 449'/.4 '25 AMP./ 449'/.5 '449/ 125'/.6 '450/ 1'/.7 '449/ 25'/.8 '449/ 50'/.9 '.5/ 450'/.10 '449/ 25'/ STAMPED ON PANS:.11 '449/ L'/.12 '449/ R'/ STAMPED ON RIDERS:.13 '449'/.14 '450'/ NO MARKINGS ON ROD.15

Missing

SET 449: KNOBBED WEIGHTS - 250 AMP [REPLACED BY ONE FROM SET 452]; 50 AMP/ FLAT WEIGHTS - 100 AMPS; .5 AMPS [BOTH REPLACED BY ONES FROM SET 450]/ ONE PAIR OF TWEEZERS

Finish

BOX, STAINED AND VARNISHED/ LINING, PURPLE/ METAL, LACQUERED

Decoration

N/A