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Digital Collections

Scientific apparatus and instruments, Electronics

Beckman Helipot Potentiometer Model SA1400A

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BY 4.0

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Black finished cylindrical casing with three copper electrodes in a line next to product inscription; nickel knob is raised above the cylinder; outer dial goes from 0-15 (but only three digits are visible through its viewing slit); outer dial value changes when inner dial (0-100) is manually rotated 360 degrees; knob handle is black plastic.

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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Extent
  • 3.125 in. H x 2.25 in. Diam.
Inscription
  • (On bottom) "311-022-00"
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Rights Creative Commons Attribution 4.0 International License
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  • Courtesy of Science History Institute

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Science History Institute. Beckman Helipot Potentiometer Model SA1400A. Photograph, 2017. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/nc580n05b.

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