Humboldt State University

Robert A. Paselk Scientific Instrument Museum

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Variable Air Condenser

Leeds & Northrup Co.



Humboldt College.; c.1950

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Used for balancing out residual capacitances or neutralizing inductance in measuring circuits, such as bridge circuits, where dielectric loss must be held low.


The instrument is about 5.5 x 5.5 x 7 inchs high. It has a dial with 0­100 divisions and two binding posts on a polished black bakelite top, mounted on a mahogany box. It is stamped NOM. MAX. VALUE .001 MF in the lower right corner on the top.


Described in Cenco Catalog J150 (1950) as item 83515, pg 1322.

HSC 1936-53 Scientific Instruments

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HSTC (1921-34)
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Last modified 1 September 2010