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Digital Collections

Scientific apparatus and instruments, Electronics

Portable Hydrogen Ion Potentiometer

  • Circa 1960

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BY 4.0

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Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and J. A. Fleming.

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Place of manufacture
Format
Genre
Medium
Extent
  • 7.375 in. H x 9.375 in. W x 6.125 in. D
Inscription
  • (Stamped into instrument panel) "LEEDS & NORTHRUP CO. / PHILADELPHIA"
  • (Metal plaque on lid) "PATENTED / LEEDS & NORTHRUP CO. / PHILADELPHIA / SER. NO. 218629 / MADE IN U.S.A."
  • (Sticker on inside lid) "Repaired: Date: / 1. Operating Condition - not to L & N Specs. / 2. Conforming to L & N Electrical Specs. / 3. Conforming to L & N Elec. and Mech. Specs. / 4. Conforming to L & N Co. Elec., Mech., and Physical Specs. / LEEDS & NORTHRUP CO."
Subject
Rights Creative Commons Attribution 4.0 International License
Credit line
  • Courtesy of Science History Institute

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Cite as

Science History Institute. Portable Hydrogen Ion Potentiometer. Photograph, 2016. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/db78tc09t.

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