These three hardcover books published by Non-Linear Systems cover the theory behind their new digital voltmeters.
The first edition was published in 1961 and contains 140 pages of theory, photos, and history behind these first edge lit display DVMs.
The second addition published in 1962 expanded the theory an additional eight chapters and contains 208 pages.
The third addition was published in 1970 and includes history, theory, and technical information, 395 pages.
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