General Information

Serial #

993

Part Number

1

Total Parts

7

AKA

N/A

Patents

N/A

General Description

WOODEN BOX WITH VELVET AND SILK LINING AND METAL HARDWARE/ WEIGHTS, BRASS/ RIDERS, METAL/ MAGNIFYING BALANCE, METAL AND GLASS/ METAL LIFTER

Dimensions

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

Length

17.8 cm

Width

11.0 cm

Height

6.8 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

Kelvin

Country

Scotland

State/Province

Unknown

City

Glasgow

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 THROUGH THE COILS BY SLIDING THE WEIGHTS ALONG A GRADUATED SCALE ON THE BEAM FROM WHICH THE CURRENT 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'S CURRENT BALANCE OF 1883. [REF 1]

Area Notes

Unknown

Details

Markings

BOX: PLATE AFFIXED TO TOP: 'ELECTRIC BALANCE/ No 993'/ PAPER LABEL INSIDE LID READS IN PART: 'ELECTRIC BALANCE No. 993/ Weight in Grammes/ Watts/ per Division/ of Movable Scale/ Carriage alone, 1.4740 - 2/ " + Weight 1, 3.6850 - 5/ " + " 2, 14.7400 - 20/.../ With 500 ohms in fine wire circuit at 100 Volts' [above in tabular form]/ STAMPED ON TOP OF.1-.5: '993'/ NO MARKINGS ON.6 &.7

Missing

APPEARS COMPLETE

Finish

BOX, STAINED AND VARNISHED; LINING IN BOX, PURPLE; LACQUERED METAL

Decoration

N/A