THE SCIENTIFIC USE OF THE PHONOGRAPH. Precious Stones in Arizona. Armor Plates. A WRINKLE IN SAWING. Fig. 2LAYING OUT WORK BY REFLECTION. Fig. 3FORTY-FIVE DEGREE ANGLE BY REFLECTION. stick and its reflected image form a square with the Effect of Contraction and Expansion on Steam Boilers. The Growth of the Alternating System. Eighty Miles an Hour. part of the run. BRATING SOAP FILM. Fig. 1.--REFLECTION SUBSTITUTED FOR THE TRY SQUARE. Fig. 2.- THE OPEIDOSCOPE APPLIED TO THE PHO NOGRAPH., scientific american, 1890-07-26
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