General Information

Serial #

3131 [.1]

Part Number

1

Total Parts

5

AKA

N/A

Patents

N/A

General Description

STEEL; SYNTHETIC; ELASTIC STRAPS

Dimensions

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

Length

159.0 cm

Width

41.0 cm

Height

39.0 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

PROBABLY THE 1960S UP TO THE 1980S

Canada

THESE RECORDERS WERE 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 1].

Function

USED TO RECORD THE MOVEMENT OF THE MIRRORS OF 3 GALVANOMETERS CONNECTED TO SEISMOMETERS IN ORDER TO PLOT THE EARTH'S MOTIONS AS A PHOTOGRAPHIC RECORD.

Technical

PREVIOUS MODELS RECORDED THE MOTION OF THE SEISMOMETER PENDULUM DIRECTLY WITH PEN ON PAPER; THIS DEVICE RECORDED THE MOTION AS REFLECTED FROM MIRRORS OF GALVANOMETERS ON TO PHOTOGRAPHIC PAPER; MODERN ONES RECORD THE CURRENT VARIATIONS OF ELECTROMAGNETS FEEDING INTO A COMPUTER [REF 1].

Area Notes

Unknown

Details

Markings

MFG'S PLATE: '[LOGO]/ SPRENGNETHER INSTRUMENT CO./ ST. LOUIS, MO./ U.S.A./ 3131'/ DECAL: 'S-20022/ DO NOT REMOVE THIS TAG'/ 3 PLATES ON TOP: 'THUNDER BAY, ONTARIO/ 48 25' N 89 16' W/ 0./ L.P./ P.L.--Z-- [ARROW]/ ON--DATE-DEBUT/ OFF-DATE-FIN/ TS 15.0 hs 1.03 Tg 81.9 hg 0.94/ UT/TU--CORR./ UT/TU--CORR./ MAG./ AMP. @ 15 sec. 3,000/ Z/ (LHC)/ CAL./ 12/83/ Ap=31''[2nd SAME AS ABOVE EXCEPT] N [NOT Z]/ TS 14.7 hs 7.12 Tg 86.6 hg 1.05/ 2,900 [not 3,000]/ N/ CAL./ 11/83/ AP=34''[3RD SAME ASABOVE EXCEPT] E [NOT Z]/ TS 15.4 hs 1.16 Tg 88.7 hg 1.04/ 2,800 [not 3,000] E/ CAL./ 12/83/ AP=35'/ ETCHED IN EACH OF 3 MIRRORS: 'TRAVEL/ RECORD/ GAS/ OIL/ GREASE'

Missing

LIGHT SOURCE FOR .1 From CA of 02/22/2002 by Matthew Bruce: No - appears complete

Finish

FRONT, BOTTOM & SIDE PANELS GREY TEXTURED FINISH/ BLACK KNOBS/ STAINLESS STEEL DRUM/ ELASTIC STRAPS/ HAS WHITE BRACKETS AFFIXED TO FRONT PANEL

Decoration

N/A