silver volt/ammeter
Datecirca 1918
Inventory Number0375a-d
ClassificationVoltmeter/ammeter
Subject
Maker
American
?
User
Department of Physics, Harvard University
founded 1884
Cultural Region
Place of Origin
Dimensions34 × 20 × 18 cm (13 3/8 × 7 7/8 × 7 1/16 in.)
Material
DescriptionA platinum cup on metal tripod stand with brass support to suspend a piece of silver in the center of cup. A solution of silver chloride was also sometimes used. The silver deposited on the platinum cup by a strong current over a period of time was used as a standard of measurement of current.
A blue triangle means it was used in the physics 3 course at Harvard.
A blue triangle means it was used in the physics 3 course at Harvard.
Signedunsigned
FunctionAdapted from an earlier model A standard for adjusting electric meter by measuring the weight of silver deposited in cup by the electric current.
ProvenanceFrom the Department of Physics, Harvard University.
Beckman Instruments, Inc.
Date: circa 1955
Accessories: instructions attached to underside of box lid
Object number: 1996-1-0276
W & A. K. Johnston, Ltd.
Date: c. 1872
Accessories: rectangular and round wood stretchers
Object number: 2008-1-0308a
Siemens & Halske AG
Date: circa 1910
Accessories: seven shunts (0560b-h)
Object number: 0560a
Weston Electrical Instrument Corporation
Date: circa 1911
Object number: 0525
Rudolph Koenig
Date: circa 1863
Accessories: repeater (item 8000b)
Object number: 8000a
Harvard Cyclotron Laboratory
Date: 1947-2002
Object number: 2003-1-0291
T. H. Letcher
Date: circa 1889
Accessories: a bottle of barium hydroxide (4510a) may have been part this set.
Object number: 4510b