magnetometer
Date1850-1900
Inventory Number0167a,b,c
ClassificationMagnetometer
Subject
Maker
English
?
Cultural Region
Dimensions34.3 × 13 × 13.3 cm (13 1/2 × 5 1/8 × 5 1/4 in.)
Material
DescriptionBlackened removable brass suspension tube on a square metal viewing box with three windows. Box stands on a round wooden base with a metallic slide bracket on bottom.
Inside the metal box stands a small round metallic mirror held from below by a vertical wire attached to a (probably magnetized) metallic bearing a few inches below.
Metallic parts and base marked a and b. Part c is most likely the metallic bracket below them. Possibly part of a set with 0168 & 0169.
Inside the metal box stands a small round metallic mirror held from below by a vertical wire attached to a (probably magnetized) metallic bearing a few inches below.
Metallic parts and base marked a and b. Part c is most likely the metallic bracket below them. Possibly part of a set with 0168 & 0169.
Signedunsigned
InscribedStamped into the bottom of wood base is "PHYSICS 3"
FunctionThis device measures the horizontal strength and direction of an unknown magnetic field. Inside the box is a mirror attached to a magnetic object below which rotates to align itself with the sum-total of the present magnetic fields. One can know the strength and direction of any unknown magnetic fields by seeing the effect on the mirror's direction of the presence of magnetic objects of known strength, so for instance one would take a measurement with and without a known magnet nearby. The change in angle could be determined very accurately by using light reflected off the mirror.
Sylvania
Date: late 19th-early 20th Century
Object number: RS0368
Fr. J. Berg
Date: circa 1900
Accessories: not complete (missing several acessories) has spare needle, leather strap
Object number: 5132
Michael A. Crawforth
Date: 1930-1950
Accessories: carrying box
Object number: 1998-1-0107
Cambridge Thermionic Corporation
Date: circa 1950
Accessories: 100W DC power supply (see 2007-1-0085)
Object number: 1997-1-0256
3M Company
Date: 1971-1972
Accessories: "VOICE/WRITER DECK - COMPENSATOR SWITCHING DIAGRAM" in instrument file.
Object number: 2004-1-0224
Edison Manufacturing Company
Date: late 19th-early 20th Century
Object number: RS0370
Ward Leonard Electric Company
Date: 1920-1940
Object number: 1997-1-1987
H. Sumner
Date: circa 1903
Accessories: wooden disks (41); steel and brass fittings; wooden box for storing accessories
Object number: WJ0112