General Information

Serial #

N/A

Part Number

1

Total Parts

1

AKA

N/A

Patents

N/A

General Description

GLASS DOME COVER/ MAPLE BASE/ IRON MAGNET/ COPPER COIL/ STEEL FEET, ELECTRICAL CONNECTORS & COIL SUPPORT FRAME/ PAPER SCALE

Dimensions

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

Length

N/A

Width

29.0 cm

Height

37.0 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

CENCO

Country

United States of America

State/Province

Illinois

City

Chicago

Context

Country

North America

State/Province

Unknown

Period

PROBABLY 1940'S & 1950'S

Canada

TYPE SAMPLE OF TYPICAL SCHOOL DEMONSTRATION EQUIPMENT

Function

USED TO DEMONSTRATE, IN THE CLASSROOM, THE FLOW (BUT NOT THE QUANTITY) OF CURRENT THROUGH A CIRCUIT, EG. A WHEATSTONE BRIDGE

Technical

ANCESTORS OF MOVING COIL INSTRUMENTS WERE 'SIPHON RECORDER' DEV'D BY WILLIAM THOMSON (1867) FOR TELEGRAPH INDUSTRY & 'FISHBONE GALVANOMETER' INVENTED BY MARCEL DEPREZ (1880). JACQUES D'ARSONVAL SUGGESTED FIXING 'FISHBONE' IN DEPREZ'S INSTRUMENT & MAKING ITS COIL MOVEABL... (COMPLETE WS IN O:DRIVE SUPP.INFO.)

Area Notes

Unknown

Details

Markings

MFG'S PLATE: 'CENTRAL SCIENTIFIC CO/ LABORATORY SUPPLIES/ APPARATUS CHEMICALS/ TRADE MARK/ CENCO/ CHICAGO, U.S.A./ NEW YORK - BOSTON - TORONTO - LOS ANGELES'/ SCALE: '10 5 0 5 10 [BY 1 DIVISION]/ CENTRAL SCIENTIFIC COMPANY/ CHICAGO' [2 TIMES]/ LABEL ON BASE: 'LEEDS AND GRENVILLE/ COUNTY BOARD OF EDUCATION/ 134621'

Missing

UPPER SUSPENSION WIRE BROKEN AT COIL END/ SOME SLIGHT METAL CORROSION

Finish

WOOD STAINED & VARNISHED/ MAGNET & MAGNET BASE PAINTED FLAT BLACK/ SCALE SUPPORT/RING ANODIZED BLACK

Decoration

N/A