File:Scientific American - Series 1 - Volume 005 - Issue 45.pdf
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![File:Scientific American - Series 1 - Volume 005 - Issue 45.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Scientific_American_-_Series_1_-_Volume_005_-_Issue_45.pdf/page1-420px-Scientific_American_-_Series_1_-_Volume_005_-_Issue_45.pdf.jpg?20120403133521)
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