Gold Enthusiast
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According to www.thomasedison.com, Thomas Edison earned 1368 separate and distinct patents in his lifetime. The link above provides a straight forward timeline of Edison's major achievements and some biographical notes. His favorite invention is said to be the phonograph. Another page you might find informative is www.tomedison.org. Enjoy!
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| Posts: 185 | Location: United States | Registered: 06-03-02 |    |
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Enthusiast
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As you will see from my previous musings, Frank, I never called it an invention but a development. I agree with your comment about the site you cite as not being sure of what an arc light was, but, Sir Humphrey Davy produced an incandescent light by connecting a carbon rod to a battery, but NOT in a glass bulb. It was Swan's idea to put the filament within a glass bulb to increase the life of the filament. As it says in the E.B. "in 1860, Swan developed a primitive electric light, one that utilized a filament of carbonized paper in an evacuated glass bulb. Lack of a good vacuum and an adequate electric source, however, resulted in a short lifetime for the bulb and inefficient light. His design was substantially the one used by Thomas A. Edison nearly 20 years later. In 1880, after the improvement of vacuum techniques, both Swan and Edison produced a practical light bulb" Maybe in the U.S. the great man, Edison, is credited with the first light bulb, but methinks he does not deserve this particular honour. Primitive and inefficient Swan's bulb may have been, but it was long before Edison's improvement of his original design. Honour where honour is due.
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| Posts: 288 | Location: Southport.U.K. | Registered: 06-03-02 |    |
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