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      Knowledge is Power

      Scientific American January 12, 1907

      Photographs with Bas-Relief Effects

      By Gustave Michaud, Costa Rica State College

      • January 12, 1907

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      More in the January 12, 1907 issue of Scientific American
      • A Novel Combined Sliding-Gear Transmission and Multiple-Disk Clutch
      • A Simple Type of Automobile Speedometer
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