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. Scientific American Volume 97 Number 16 (October 1907) . ) 1907 SCIENTIFIC AMERICAN, INC. October 19, 1907. Scientific American 283 Manufacturers! Investigate ^Portsmouth, Virginia^ Portsmouth offers unequalled advantages for theprofitable operation of almost any manufacturingindustry. It is the natural gateway between theresources and markets of the Korth and South, draw-ing from and catering alike to both. Cheap fuel atthe very door, an abundance of reliable labor andan inexhaustible supply of raw material. Sine linesof railway and a score of lines of water transpor-tation assure exception
. Scientific American Volume 97 Number 16 (October 1907) . ) 1907 SCIENTIFIC AMERICAN, INC. October 19, 1907. Scientific American 283 Manufacturers! Investigate ^Portsmouth, Virginia^ Portsmouth offers unequalled advantages for theprofitable operation of almost any manufacturingindustry. It is the natural gateway between theresources and markets of the Korth and South, draw-ing from and catering alike to both. Cheap fuel atthe very door, an abundance of reliable labor andan inexhaustible supply of raw material. Sine linesof railway and a score of lines of water transpor-tation assure exceptionally low freight rates. Adelightfully even climate, pure water,good schools,good health and beautiful homes. Splendid factory sites and business opportunities are now available. Valuable assistance will be given investigators. Full particulars on request. Address I. T. VAN PATTEN, Secretary. Portsmouth, JAGER Marine4-Cycle Engines Skillfully designed and wellbuilt. Single lever control, com-bining automatic carburettorwith sptrk advance. Developswide speed ranee and redabilityunder most trying conditionsSizes Sto60 h. p. Send for catalog. CHAS. J. JAGER Franklin, cor. Batterymarch , Mass. How to ConstructAn Independent Interrupter In SciEXTiPrc American Supplement, 1615,A. Frederick Collins describes fully and clearly withthe help of good drawings how an independent multipleInterrupter may be constructed for a large inductioncoil. This article should be read in connection withMr. Collinsarticle in scientific American Supple-ment, 1605, How to Construct a 100-MileWireless Telegraph Outflt. Each Supplement costs 10 cents; 20 cents for thetwo. Order from your newsdealer or from MUNN & CO., 361 Broadway, New York WET PROCESS CONCRETE IS BEST Our new Invincible Concrete Block Machine makes blocksface down, wet process, damp cured. Triple Tier Rack-ing System cures and
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