one half. To concave mirror, in front of which a small] plano-convex lens The gas which supplies this lampblack comes from the illustrate how this may be done, suppose we have three hun- is supported by a jointed arm projecting from the main dred people to provide with a home. If we divide them… … not yet reached. Before many years, an unbroken score of A beam of parailel rays being thrown on the concave mir- one thousand dollars. A sewing machine for each small thirty bull’s eyes at 1,000 yards will have to be credited to ror froma lantern or porte lumiére, and the vibratory tongues family…
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