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A Portable Vacuum-Tube Millivoltmeter

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This article describes in detail a portable vacuum-tube millivoltmeter which has proved practicable for field use in measuring voltage gradients in trees.
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Document Type: Journal Article

Affiliations: Assistant Entomologist, Bureau of Entomology and Plant Quarantine, U. S. Department of Agriculture, New Haven, Conn.

Publication date: 01 June 1943

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