Perkins, Henry, 1803-1889, publisher, Haswell, Barrington, and Haswell, printer, McManus-Young Collection (Library of Congress) DLC · Philadelphia : H. Perkins, 134 Chestnut Street · leaf 182
r, in order to prevent any unpleasant sen-sation on the contact of the instrument with the skin. When it is desired to take a likeness, the instrument is ap-plied to the face with a gentle and gradual pressure, the wireseasily yield and slide back, conformably to the prominences ofthe countenance;… … INFINITE DIVISIBILITY OF MATTER. Dissolve a single grain of copper in about one dram of nitricacid, and dilute the solution with about one ounce of water, when 12 162 MELANGE. it will be evident that a single drop of the mixture must containan almost immeasurably small portion of copper. Yet, if…
Scientific recreations
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