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by Science Source
$6.95
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Our greeting cards are 5" x 7" in size and are produced on digital offset printers using 100 lb. paper stock. Each card is coated with a UV protectant on the outside surface which produces a semi-gloss finish. The inside of each card has a matte white finish and can be customized with your own message up to 500 characters in length. Each card comes with a white envelope for mailing or gift giving.
Design Details
Edison's carbon filament incandescent lamp heralded a lighting revolution. The diagrams demonstrate the basic principles of the filament lamp. After... more
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Edison's carbon filament incandescent lamp heralded a lighting revolution. The diagrams demonstrate the basic principles of the filament lamp. After many experiments, first with carbon filaments and then with platinum and other metals, in the end Edison returned to a carbon filament. The first successful test was on October 22, 1879 it lasted 13.5 hours. Edison continued to improve this design and by November 4, 1879, filed for U.S. patent 223,898 (granted on January 27, 1880) for an electric lamp using "a carbon filament or strip coiled and connected to platina contact wires". This was the first commercially practical incandescent light. Illustration appeared in "The Scientific American", January 10, 1880. This image has been color enhanced.
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