File:Scientific American - Series 1 - Volume 008 - Issue 13.pdf
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![File:Scientific American - Series 1 - Volume 008 - Issue 13.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Scientific_American_-_Series_1_-_Volume_008_-_Issue_13.pdf/page1-420px-Scientific_American_-_Series_1_-_Volume_008_-_Issue_13.pdf.jpg?20120421143943)
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