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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.

Manufacturer
Place of manufacture
Format
Genre
Medium
Extent
  • 18.7 cm H x 23.8 cm W x 15.6 cm 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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Science History Institute. Portable Hydrogen Ion Potentiometer. Photograph, 2016. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/db78tc09t.

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