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Description
Vintage 20th century Leeds & Northrup Portable Precision Potentiometer - Leeds & Northrup Co, Philadelphia, PA - 723355 - Made in USA. Housed in oak case with Excelsior latches. Includes instruction book.
"A potentiometer is an instrument for measuring voltage or 'potential difference' by comparison of an unknown voltage with a known reference voltage. If a sensitive indicating instrument is used, very little current is drawn from the source of the unknown voltage. Since the reference voltage can be produced from an accurately calibrated voltage divider, a potentiometer can provide high precision in measurement. The method was described by Johann Christian Poggendorff around 1841 and became a standard laboratory measuring technique." (Source: wikipedia)
Condition
Good Overall - Gentle wear; missing handle
Dimensions
20.5" x 9" x 9.5" (Width x Depth x Height)