potentiometer with instructional chart
Date1923
Inventory Number1997-1-0393
ClassificationPotentiometer
Subject
Maker
Gray Instrument Company
1912 - 1925
Cultural Region
Place of Origin
Dimensions13.2 × 30.6 × 21.2 cm (5 3/16 × 12 1/16 × 8 3/8 in.)
Material
DescriptionPotentiometer in a wooden case. Instructional chart--a schematic of the circuit--is tacked into the lid of the case.
Signedon chart: GRAY INSTRUMENT CO. / "QUEEN INSTRUMENTS" / PHILA., PA. / G. W. S. 3-30-23
on potentiometer dial: GRAY INSTRUMENT CO. / "QUEEN INSTRUMENTS" / PHILA., PA., U.S.A.
Curatorial RemarksChem Lab No E1253 D.P. O.K.R. (Rice) cost 60.00 12-2-31 from Chem Lab Dec 1980 G.W.S. 3-30-28 has diagram in cover
FunctionFor making highly accurate and precise general electrical measurements such as potential difference and current, also for measuring temperature and pH.
A potentiometer is an instrument for measuring the potential (voltage) in a circuit against a standard cell. Before the introduction of the moving coil and digital volt meters, potentiometers were used in measuring voltage, hence the '-meter' part of their name. The method was described by Johann Christian Poggendorff around 1841 and became a standard laboratory measuring technique.
This information, and more, can be found on the following website.
A potentiometer is an instrument for measuring the potential (voltage) in a circuit against a standard cell. Before the introduction of the moving coil and digital volt meters, potentiometers were used in measuring voltage, hence the '-meter' part of their name. The method was described by Johann Christian Poggendorff around 1841 and became a standard laboratory measuring technique.
This information, and more, can be found on the following website.
Leeds & Northrup Company
Date: circa 1930
Accessories: cover; instruction sheet inside of cover
Object number: 1997-1-0204
Leeds & Northrup Company
Date: circa 1950
Accessories: wood cover
Object number: 2003-1-0042
Leeds & Northrup Company
Date: circa 1932
Accessories: mahogany cover
Object number: 1997-1-0200
General Electric Company
Date: 1900-1930
Accessories: carrying case
Object number: 1997-1-0260
Leeds & Northrup Company
Date: 1949-1958
Accessories: includes a grey plastic dust cover with Leeds & Northrup logo in red
Object number: 2000-1-0039
Leeds & Northrup Company
Date: 1925-1935
Accessories: cover; instruction sheet inside of cover
Object number: 1997-1-0201
Leeds & Northrup Company
Date: circa 1920
Accessories: cover; instruction sheet inside of cover
Object number: 1997-1-0180
Leeds & Northrup Company
Date: circa 1926
Accessories: cover; instruction sheets inside of cover (2)
Object number: 1997-1-0205