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Rare 1881 EDISON Dynamo Electric GENERATOR & LAMP Views
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Rare 1881 EDISON Dynamo Electric GENERATOR & LAMP Views
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Original & RARE "THE INDUSTRIAL WORLD COMMERCIAL ADVERTISER" Trade Journal (Chicago) dated Thursday, February 17, 1881. COMPLETE in 28 pages, Folio (15 3/4" x 10 3/4"). Featured in this issue is the FULL PAGE article "THE ELECTRIC LIGHT" containing TWO (2) engraved views: "EDISON'S STEAM DYNAMO-ELECTRIC MACHINE" (7" X 9 1/4") & "THE EDISON LAMP" (4 3/4" X 4")(published in a Jan,1881 issue of Scientific American.)The article reads, "Since the discovery of the adaptability of electricity to mechanical uses great advancement has been made in the invention of appliances for utilizing this wonderful power. In no direction in this field has t been expanded more thought or displayed greater inventive genius, than in perfecting the electric light. Considerable time has elapsed since it was definitely ascertained that electricity could be successfully and economically employed for lighting large spaces and several notable inventions have been introduced for lighting streets, hotels, factories and stores, but the question of successfully sub-dividing the electric light so that it might be used in place of the ordinary gas light, for private or public use, was found to by a much more difficult matter, and by some believed to be impossible of accomplishment. Edison, however, claimed that this could be done and some little time since made the announcement of the perfection of his invention of a light in which the current of electricity could be sub-divided and controlled as easily as the ordinary gas-jet...The Industrial World is pleased to give the accompanying illustrations which show the latest design of the Edison lamp and the new and powerful dynamo-electric machine used in producing the electricity for supplying a circuit of these lights. Mr. Edison, in a recent article in the North American Review, describes his lamp as follows: 'The perfected lamp consists of an oval bulb of glass about five inches in height, pointed at one end, and with a short stem three quarters of an inch in diameter at the other. Two wires of platinum enter the bulb through this stem, supporting the loop or U-shaped thread of carbon, which is about two inches in height...When the circuit is made, the resistance offered to the passage of the electric current by the carbon causes the loop to acquire a high temperature and to become incandescent; but, as it takes place in a vacuum, the carbon is not consumed. The 'life' of a carbon loop through which a current is passed continuously varies from seven hundred and fifty to nine hundred hours...'. The dynamo-electric machine represented in the engraving is one of the largest ever built and is now being mad at Mr. Edison's works at Menlo Park. This machine is mounted on a cast iron bed, 8 1/2 by 7 feet and 2 feet deep. This bed is massive and of very strong construction, weighing with the machine some eight tons. The dynamo-electric machine is placed near the centre of this bed. The field magnets, which are three in number, are 6 1/2 feet long. The armature, which weighs 1 1/2 tons, is 28 inches long and 21 inches in diameter, and has a direct connection with the engine, the crank disk, being placed directly on the armature shaft. The engine employed is of high speed, being a Porter-Allen engine of 100 horse power, built in Philadelphia. The internal diameter of the cylinder is 9 inches. The stroke is ten inches and the cut off one-fifth of the stroke. The engine is capable of making 600 revolutions per minute. The working pressure of the dynamo is 140 volts and the resistance of the armature is 1/2 hundredth of an ohm...".This industry trade journal contains MANY full pages of engraved ads for industrial/mechanical products from across the country!!
IN VERY GOOD CONDITION! Pages have a small dog-earred lower outside corner, affecting blank border mostly. We unconditionally warrant, without time limit, the authenticity of this original 1881 Industrial World trade journal. We have been dealing in historical newspapers and fine documents since 1974. Dba "Historical Newspapers ... 
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