File:Scientific American - Series 2 - Volume 004 - Issue 18.pdf
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![File:Scientific American - Series 2 - Volume 004 - Issue 18.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c4/Scientific_American_-_Series_2_-_Volume_004_-_Issue_18.pdf/page1-411px-Scientific_American_-_Series_2_-_Volume_004_-_Issue_18.pdf.jpg?20131124230516)
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