Scientific American Supplement, No. 717, September 28, 1889

by Various

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SCIENTIFIC AMERICAN SUPPLEMENT NO. 717

NEW YORK, SEPTEMBER 28, 1889.

Scientific American Supplement. Vol. XXVIII., No. 717.

Scientific American, established 1845.

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

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TABLE OF CONTENTS.
		PAGE
I.	[CIVIL ENGINEERING.—The GirardHydraulic Railway.—One ofthe great curiosities of the Paris exposition, the almost frictionlessrailway, with sectional illustrations of its structure.—8illustrations.]	11451
II.	[ELECTRICITY.—Early ElectricLighting.—Electric lighting inSalem in 1859, a very curious piece of early history.]	11458
	[Electric Motor for AlternatingCurrents.—A motor on an entirelynew principle for the application of the alternating currentwith results obtained, and the economic outlook of the invention.]	11458
	[Portable ElectricLight.—A lamp for military and other use, inwhich the prime motor, including the boiler and the lamp itself,are carried on one carriage.—1 illustration.]	11458
	[The ElectricAge.—By Charles Carleton Coffin.—A shortresume of the initial achievements of modern electricity.]	11458
III.	[GEOLOGY.—TheFuels of the Future.—A prognosis of the futureprospect of the world as regards a fuel supply, with a specialreference to the use of natural gas.]	11457
IV.	[MISCELLANEOUS.—Preservationof Spiders for the Cabinet.—Amethod of setting up spiders for preservation in the cabinet,with formulæ of solutions used and full details of the manipulation.—1illustration.]	11461
	[The Ship inthe New French Ballet of the "Tempest."—A curiousexample of modern scenic perfection, giving the constructionand use of an appliance of the modern ballet.—5 illustrations.]	11450
V.	[NAVALENGINEERING.—Crank and Screw Shafts of the MercantileMarine.—By G. W. Manuel.—This all-important subjectof modern naval engineering treated in detail, illustrating the progressof the present day, the superiority of material and methodof using it, with interesting practical examples.—1 illustration.]	11448
	[Experimental Aidin the Design of High Speed Steamships.—ByD. P.—A plea for the experimental determination of the probablespeed of ships, with examples of its application in practice.]	11449
	[Forging a PropellerShaft.—How large steamer shafts are forged,with example of the operation as exhibited to the Shah of Persiaat Brown & Co.'s works, Sheffield, England.—1 illustration.]	11447
	[The Naval Forgesand Steel Works at St. Chamond.—The forgingof a piece of ordnance from a 90 ton ingot of steel, an artisticpresentation of the subject.—1 illustration.]	11447
VI.	[PHOTOGRAPHY.—ThePyro Developer with Metabisulphite ofPotash.—By Dr. J. M. Eder.—Anew addition to the pyro developer,with formulæ and results.]	11462
VII.	[PHYSICS.—QuartzFibers.—A lecture by Mr. C. V. Boys on hisfamous experiments of the production of microscopic fibers, withenlarged illustrations of the same, and a graphic account of theentire subject.—7 illustrations.]	11452
	[The ModernTheory of Light.—By Prof. Oliver Lodge.—Anabstract of a lecture by the eminent investigator and expositor ofProf. Hertz's experiments, giving a brief review of the present aspectof this absorbing question.]	11459
VIII.	[PHYSIOLOGY.—Heatin Man.—Experiments recently made byDr. Loewy on the heat of the human system.—Described and commentedon by Prof. Zuntz.]	11461
IX.	[SANITATION.—OnPurification of Air by Ozone—with an Accountof a New Method.—By Dr. B. W. Richardson.—A very importantsubject treated in full, giving the past attempts in theutilization of ozone and a method now available.]	11460
X.	[TECHNOLOGY.—AlkaliManufactories.—Present aspect of theLeblanc process and the new process for the recovery of sulphurfrom its waste.]	11457
	[Dried WineGrapes.—The preparation of the above wine on alarge scale in California, with full details of the process adopted.]	11461
	[The Productionof Ammonia from Coal.—By Ludwig Mond.—Avaluable review of this important industry, with actual workingresults obtained in carrying out a retort process.—2 illustrations.]	11454
	[Nature, Composition,and Treatment of Animal and VegetableFabrics.—The history of fabrics and fibers in the vegetable andanimal world, their sources, applications, and treatments.]	11453
	[Walnut Oil.—ByThomas T. P. Bruce Warren.—An excellentoil for painters' use, with description of a simple method for preparingit on a small scale.]	11462

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