Wire, torsion balance

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Ingenium, 1987.2121.008
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OBJECT TYPE: N/A
DATE: Unknown
ARTIFACT NUMBER: 1987.2121.008

MANUFACTURER: Suss Nandor R.T.
MODEL: Unknown
LOCATION: Budapest, Hungary

More Information

General Information

Serial #: N/A
Part Number: 8
Total Parts: 10
AKA: N/A
Patents: N/A
General Description: PRIMARILY METAL CONSTRUCTION. GLASS OPTICS & THERMOMETER ON .1. SOME SYNTHETIC COMPONENT PIECES. .2 FITTED WITH GLASS SUNSHADE OVER CIRCLE & 2 GLASS LEVEL VIALS; HORIZONTAL CIRCLE DIVIDED ON SILVER. CASES FOR .1-.2, .8-.10 MADE OF WOOD

Dimensions

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

Length: 51.7 cm
Width: 8.0 cm
Height: 2.5 cm
Thickness: N/A
Weight: N/A
Diameter: N/A
Volume: N/A

Lexicon

Group: Physics
Category: Geophysics
Sub-Category: N/A

Manufacturer

AKA: Suss
Country: Hungary
State/Province: Unknown
City: Budapest

Context

Country: Canada
State/Province: Ontario
Period: THIS INSTRUMENT USED BETWEEN 1928-1935. THIS TYPE OF INSTRUMENT USED LATE 1920S- EARLY 1930S (REF.1, P.167)
Canada: ONE OF TWO EOTVOS-TYPE TORSION BALANCES PURCHASED FOR JOINT USE OF DOMINION OBSERVATORY & GEOLOGICAL SURVEY. THESE INSTRUMENTS WERE AMONG THE FIRST IN CANADA. A.H. MILLER (1886-1962), USED THESE BALANCES, AND OTHER EQ. IN SOME OF THE EARLIEST GRAVITY SURVEYS & ISOSTACY STUDIES CONDUCTED IN CANADA (REF.2) SEE ALSO 872131
Function: TO MEASURE THE GRADIENT OF GRAVITY AT A SPECIFIC POINT OR LOCATION, AND THE CURVATURE OF THE EQUIPOTENTIAL SURFACE.
Technical: DEV'T BY HUNGARIAN BARON ROLAND VON EOTVOS THE TORSION BALANCE BECAME ONE OF THE MAIN INSTS. USED IN GEOPHYSICAL PROSPECTING IN L.1920S-E.1930S. THE BALANCE CONSISTS OF A HORIZONTAL BEAM WITH A MASS AT EITHER END (ONE ON THE BEAM, ONE SUSPENDED FROM IT), THE WHOLE SYSTEM SUSPENDED BY A TORSION FIBRE. THE BEAM WAS SET IN A PARTICULAR AZIMUTH, RELEASED, AND THE TENSION IN THE SUSPENDING FIBRE NECESSARY TO PRODUCE EQUILIBRIUM NOTED. THE BEAM WAS THEN RESET AND MEASUREMENTS REPEATED, THROUGH A SEQUENCE OF 5 AZIMUTHS. IT TOOK APPROX. 1 HOUR FOR THE BEAM TO COME TO REST. BALANCES HAVING 2 BEAMS, LIKE 872121, CUT TIME IN HALF, REQUIRING ONLY 3 SETS OF OBSERVATIONS. (Ref.1, p.167)
Area Notes: Unknown

Details

Markings: Torsion wire box: NB: Box designed to contain 2 wires: these are secured behind the paper label, and are almost invisible. USE EXTREME CAUTION IN HANDLING EITHER THE LABEL OR THE WIRES. SN "36867 " incised on box top. Paper label fastened over wires bears following handwritten text: " Length= 40.cm/ { Torsion-wire No. XV.b 48. Torsion constant: 0.03951 CGS. Temperature coefficient: +0.041.sc.div./ Torsion-wire No. XV.b.54 Torsion constant: 0.04010 CGS. Temperature coefficient:- 0.032.sc.div. ". Blue ink stamp on label reads: " BARO EOTVOS LORANO/ BUDAPEST/ GEOFIZIKAIINTEZET ". 4 screw fastening label over torsion wires- each incised "MURILLO/ No. 3 ".
Missing: From CA of 02/07/2002 by David Daley: Yes - empty compartment in small trunk suggests missing components
Finish: Unknown
Decoration: N/A

CITE THIS OBJECT

If you choose to share our information about this collection object, please cite:

Suss Nandor R.T., Wire, torsion balance, Unknown Date, Artifact no. 1987.2121, Ingenium – Canada’s Museums of Science and Innovation, http://collections.ingeniumcanada.org/en/id/1987.2121.008/

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