NAPIER'S DEFINITION OF A LOGARITHM AND ITS CONSEQUENCES, by IRVING STRINGHAM. Transcript of a Paper read at the Technical Society of the Pacific Coast on June 6, 1890. Disbound, loose pages, 5.5x8.5 inches, 8 pages (numbered 63-70). Disbound from Transactions of the Technical Society of the Pacific Coast, Volume VII, June, 1890. Disbound, loose pages, rough spine edges where the document was disbound, slight age toning, printing remains sharp and clear. Rare paper on Logarithms by the noted mathematician IRVING STRINGHAM. You can read about him on Wikipedia.