File:Grandest century in the world's history; containing a full and graphic account of the marvelous achievements of one hundred years, including great battles and conquests; the rise and fall of nations; (14781607212).jpg

Identifier: grandestcenturyi00nort (find matches)
Title: Grandest century in the world's history; containing a full and graphic account of the marvelous achievements of one hundred years, including great battles and conquests; the rise and fall of nations; wonderful growth and progress of the United States ... etc., etc
Year: 1900 (1900s)
Authors: Northrop, Henry Davenport, 1836-1909
Subjects: Nineteenth century
Publisher: Philadelphia, Pa., National publishing co
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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tsong from the depths of the phonograph,understand in the least the mechanismby which the sounds arc produced. Theexplanation is as follows: The phono-graph is composed of a metal cylinder covered with a layer of wax, on whicha pointed pen inscribes tracings, cor-responding to the vibrations caught bya membrane placed on the top of the pen.The wax-coated cylinder is rapidlyrevolved by means of an electric bat-tery, and as one speaks in front of themembrane, the cylinder advances slowlyin a horizontal position, at the sametime revolving rapidly. 458 MARVELLOUS INVENTIONS AND DISCOVERI±JS. The membrane vibrates much or lit-tle, according to the sounds emitted bythe operator. The pen moves accord-ing to the vibrations, and peculiar,almost imperceptible tracings on thewax are the result. On top of the mcm- plied to their ears, as in the iliustra-tion. Not only jan we hear the soundsfrom the same phonograph into whichthey are spoken, but the cylinders maybe preserved and taken wherever we
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MR. EDISON TAI^iirNG INTO THE PHONOGRAPH. brane ir> a funnel into which the opera-tor speaks. To obtain reprodiictions of the roundsas inscribed on the wax cylinder, it (creplaced in its original position. An-other pen of different constructiou thanthe first is put into play, and in a mostexact and delicate manner transfers tothe wax of another cylinder the tracingson the first. The funnel is replaced bya rubber tube having two, four or sixbranches, according to the number ofthe auditors, and the tubes a.r^ ^p wish ; by placing them again in a me-chanism as above described, the origi-nal sounds may be reproduced. In this manner are made the piiono-graphs found in many hotels and pub-lic plaices. The first cylinder is care-fully made as above described, and du*plicated as many times as required.Each cylinder is then placed in a case,and the phonograph may be put in usewhen required. The new and perfected Edison plion-ograph has already gone into very gen^ MARVEIyLOUS INVENTIONS AND

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