General Information

Serial #

1948

Part Number

1

Total Parts

5

AKA

N/A

Patents

N/A

General Description

METAL - STEEL AND IRON/ SYNTHETIC KNOBS AND SPOOLS/ BRASS FEET/ COPPER WIRE

Dimensions

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

Length

65.0 cm

Width

65.0 cm

Height

58.5 cm

Thickness

N/A

Weight

N/A

Diameter

N/A

Volume

N/A

Lexicon

Group

Physics

Category

Geophysics

Sub-Category

N/A

Manufacturer

AKA

Sprengnether

Country

United States of America

State/Province

Missouri

City

St. Louis

Context

Country

Canada

State/Province

Ontario

Period

THIS ONE USED FROM 1967 PROBABLY TO THE 1980S. PROBABLY STARTED BEING MADE C. 1951

Canada

THIS DEVICE WAS PART OF A SEISMOGRAPH STATION WHICH WAS ONE OF ABOUT 2 DOZEN THAT WERE INSTALLED ACROSS CANADA IN THE GSC'S NETWORK TO MONITOR ACTIVITY OF THE EARTH'S CRUST TO DETERMINE THE LOCATION OF EARTHQUAKES. THIS INFORMATION WAS USED BY RESEARCHERS STUDYING DYNAMICS OF THE EARTH'S CRUST & PLATE DYNAMICS [REF 3]

Function

INSTRUMENT FOR MEASURING MOTIONS OF THE GROUND THAT RESULT FROM NATURAL DISTURBANCES SUCH AS EARTH QUAKES AND EXPLOSIONS [REF 2]

Technical

SEISMOGRAPHS HAVE UTILIZED PENDULUMS AS THE MOTION SENSING DEVICE FOR 1 1/2 C. THIS ONE USES SENSITIVE ELECTROMAGNETS TO DETECT PENDULUM MOTION WHICH IN TURN RECORDED MOTION OF A MIRROR IN A GALVANOMETER ON PHOTOGRAPHIC PAPER. MODERN ONES RECORD THE CURRENT VARIATIONS IN THE ELECTROMAGNETS FEEDING INTO A COMPUTER [REF 3]

Area Notes

Unknown

Details

Markings

.1 MFG PLATE ON BASE: '[LOGO]/ SPRENGNETHER INSTRUMENT CO./ ST. LOUIS, MO./ U.S.A./ 1948'/ DECALS ON COVER: 'SPRENGNETHER/ INSTRUMENT CO./ U.S.A.''S-50383/ DO NOT REMOVE THIS TAG'/.2 HANDWRITTEN ON TOP: 'LHC/ PN/ 1948/ A B'/.3 HANDWRITTEN ON TOP: '1948 B'/.4 HANDWRITTEN ON TOP: '1948 A'/.5 HANDWRITTEN ON SIDE: '1948'

Missing

PROBABLY MOLDING AROUND BOTTOM OF COVER From CA of 02/21/2002 by Matthew Bruce: No - appears complete

Finish

.1 HAMMELIN GREY FINISH ON COVER & INTERIOR BRACKETS/ SILVER PAINT ON BASE/ BLACK KNOBS & MAGNETS/.2 HAMMELIN GREY/.3 CLEAR SPOOL WITH COPPER WIRE/.4 CLEAR SPOOL WITH PINK WIRE/.5 HAMMELIN GREY/ FEET LACQUERED

Decoration

N/A