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Scientific American, Vol. 84, No. 21 (1901) (1901)
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be done with deliberation and ments are within easy reach. In the horizontal posi- differed from a few seconds to one hour. No rules of care to prevent injury to the keen razor edge and to tion focusing is generally much more difficult. much value can be given, but the beginner will grad- Figs. 2… … for $100. ably magnified, which would render conspicuous any Fig. 3.—BEE’S STING. Fig. 4—NEEDLE POINT. © 1901 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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