Hall's Alphabet of geology; or, First lessons in geology and mineralogy. With suggestions on the relation of rocks to soil - Softcover
Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1868 Excerpt: ...to reflect the colors of the rainbow? Different names of anthracite? How does it usually occur? Ingredients of graphite? Could it be used as fuel? Its common uses? By what other name is it known? Describe it. Is it considered valuable? LESSON XXVIII. mcmns. THE next class of substances, to which attention may be directed, is Metals. As the names of many of these are more commonly known, and their uses betterundcrstood, the accountof them will be very brief. A metal is a shining, opaque body, having a metallic lustre, and insoluble by water, but fusible by heat. Metals are good conductors of electricity and caloric. Many are malleable, that is, can be hammered or rolled into plates. Some are ductile, that is, they can be drawn into wire. A few of the metals are found in a pure or metallic state, but more generally in the state of ores. A frequent division of metals into malleable and brittle is made; but this is not of much importance. Several were early known, but many have been discovered wit.hin a few years. The whole number now known is less than fifty. Forty-two have been described. Less than half of the known metals are of much value to the world. The most important malleable metals are platina, gold, silver, mercury, lead, copper, tin, iron, zinc, palladium, nickel, and cadmium. Sixteen others are not capable of being much extended by heat, and are called brittle. These arearsenic, antimony, bismuth, cobalt, manganese, tellurium, titanium, columbium, molybdena, tungsten, chrome, osmium, iridium, rhodium, uranium, cerium. Potassium. sodium, barium, strontium, calcium, lithium, and some others, have been recently discovered, and were not known till the present century. Platinum, gold, and silver are most valuable by weight. Platinum is the heaviest of a...
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