File:Scientific American - Series 1 - Volume 014 - Issue 29.pdf
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![File:Scientific American - Series 1 - Volume 014 - Issue 29.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/6/68/Scientific_American_-_Series_1_-_Volume_014_-_Issue_29.pdf/page1-409px-Scientific_American_-_Series_1_-_Volume_014_-_Issue_29.pdf.jpg?20120421053759)
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