magnetometer
Datecirca 1850
Inventory NumberDW0521
ClassificationMagnetometer
Subject
Maker
English
Cultural Region
Dimensionsinstrument: 37.5 × 10.2 × 10.5 cm (14 3/4 × 4 × 4 1/8 in.)
case: 42.5 × 14.2 × 12.8 cm (16 3/4 × 5 9/16 × 5 1/16 in.)
blue board tray: 10.2 × 15.9 × 14 cm (4 × 6 1/4 × 5 1/2 in.)
case: 42.5 × 14.2 × 12.8 cm (16 3/4 × 5 9/16 × 5 1/16 in.)
blue board tray: 10.2 × 15.9 × 14 cm (4 × 6 1/4 × 5 1/2 in.)
Material
Accessoriestall slim mahogany case
DescriptionA horizontal brass cylinder on a tripod foot, with glass caps, would contain inside a magnetic bar, suspended from a thread (resistant to torsion) coming down the vertical glass tube (25cm). Scale on top of cap to adjust zero torsion of the thread.
The magnetic iron bar is now missing.
The magnetic iron bar is now missing.
Signedunsigned
Curatorial RemarksMagnet. iron bar missing.
FunctionTo determine the strength of magnetic fields. Reading given by a torsion scale on top of the glass tube that registers the tendency of the magnetic bar to turn in the presence of magnetic fields.
From Card:
"To determine the zero setting on the torsion scale at the top of the glass tube a brass bar with a small hook at its center is fastened to the suspension and the adjustment made. Then the magnetised iron bar is substituted and the new setting read, to give the deflection."
From Card:
"To determine the zero setting on the torsion scale at the top of the glass tube a brass bar with a small hook at its center is fastened to the suspension and the adjustment made. Then the magnetised iron bar is substituted and the new setting read, to give the deflection."
ProvenanceDavid Wheatland purchased from Saul Moskowitz, Marblehead, Massachusetts, June 27, 1978 (catalog 116, #243). Donated to CHSI 1985.
Emile Gallemaerts
Date: circa 1911
Accessories: rule; loose screw (see curatorial remarks)
Object number: DW0398
Fr. J. Berg
Date: circa 1900
Accessories: not complete (missing several acessories) has spare needle, leather strap
Object number: 5132
Harold C. Ernst
Date: 1900-1930
Accessories: leveling screw
Object number: 1996-1-0178
C. L. Berger & Sons
Date: circa 1902
Accessories: pine case with lock (key not found); screwdriver; leather strap; sunshade; dust cover; tripod (see 5161b)
Object number: 5161a
Iszard-Warren Co., Inc.
Date: circa 1910
Accessories: mahogany case with brass corners and lock; key missing; leather strap; screwdriver; dust cover; sunshade; tripod, see 5150b
Object number: 5150a
Buff & Berger
Date: circa 1890
Accessories: mahogany case with lock (key not found); leather strap; screwdriver; dust cover; sunshade; tripod, see 5149b
Object number: 5149a
James E. Moody
Date: circa 1880
Accessories: mahogany case; sunshade; dust cap; tripod (5141b)
Object number: 5141a
Herman E. Fessel
Date: circa 1870
Accessories: mahogany case; sunshade; dust cover; tripod (5145b)
Object number: 5145a