tant discoveries in the field of acoustics. He was one of the associated editors of the circles and also diameters 45° apart. The mirror can they are far away, while the second appear to move American Journal of Science. One of Prof. Mayer’s be turned in its own plane about its center by the aid… … The lamp may be fed by a dynamo or ac- It would seem an easy matter to tell in cumulator in a steam launch. The photo- what direction the clouds are moving, but M. graphic apparatus consists of a detective J. R. Plumadon, the French meteorologist of the Puy- millimeters is fixed on the edge. It…
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