Journal of the Elisha Mitchell Scientific Society, Band 22Elisha Mitchell Scientific Society, 1906 Vols. 20- include Proceedings of the North Carolina academy of science, 1902- |
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Algonkian American Chemical Society amount amphibolite attractive forces belt body calories Cement Gold chemists Collier Cobb color conglomerate constant contraction coral corallum corundum crystalline Currituck Banks cycle deposits diabase diameter diet dikes diorite distance dunes Elisha Mitchell Elisha Mitchell Scientific entosepta epidote equation ether exocoelic fact feet follows g substance gave gases Geological gneisses grams granite Granite Belt Hatteras Hatteras Island hole hornblende investigation Island Journal kinetic known laboratory ligroin liquid marble mass matter mesenteries minerals Mitchell county Mitchell Scientific Society molecular attraction molecules nitrogen North Carolina orbicular paper peridotites permanent septa plagioclase polyps present pressure produced Professor Duerden professor of chemistry proteid pyroxenite quarrying quartz radiated radium rocks sand sandstones schists septa Siderastrea specific heat sun's heat sun's surface temperature texture theory thickness tion unakite University vapor vary W. C. Coker zoanthids
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Seite 9 - Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania, New Jersey, New York...
Seite 78 - A pipe is then cemented into the hole and connected by means of a globe valve to an air pipe line from an air compressor. Compressed air at...
Seite 12 - ... occur in portions of the belt in North Carolina makes it quite probable that many, if not all, of these amphiboliferous types have had a like origin. Chapter vi deals with the mineralogy and technology of corundum, including its crystallography, its physical and chemical properties, its applications in the arts, and an outline of the process of manufacture of the several types of corundum and emery wheels on the market. Chapter vii, on modes of occurrence, shows corundum to be a constituent of...
Seite 66 - These processes of change, as noted above, are dependent very largely upon the actual movements, warpings and foldings as one might say, of the earth's crust and the heat and chemical action which is thereby generated, and since these movements take place only with extreme slowness, whole geologic ages being occupied in their inception and completion, it follows as a matter of course that these metamorphic rocks, these gneisses, marbles and roofing slates, are found only among the older rocks and...
Seite 119 - That is, the attractive forces, whatever their nature, whether chemical, molecular, magnetic, electrical, or gravitational, which proceed from a particle are definite in amount. If this attraction is exerted upon another particle the amount of the attraction remaining to be exerted upon other particles is diminished by an exactly equivalent amount.
Seite 66 - ... company, but, since there was only one operator, the figures of value of the production are combined with those of another subject, in order not to disclose private business. MINERAL PAINTS Ocher of more or less purity is found, and has been mined to some extent in each of the principal geologic divisions of the State, namely, the Coastal Plain, the Piedmont Plateau, and the Valley region. It has been mined at the following localities in Virginia: In the extreme eastern part of Chesterfield county,...
Seite 78 - Woodroffe, vicepresident of the company, as follows : In the center of the sheet or area to be lifted a drill hole 2 to 3 inches in diameter is sunk 6 to 8 feet in depth, depending on the greatest thickness of stone required, and the operation is continued by the discharge of successive small amounts of powder similarly as described, under the method of quarrying by using water until the crevice extends a distance of 75 feet or more from the hole in all directions.
Seite 78 - ... passed up and down the hole until the crack is located. After the crack has once been started the charges are gradually increased until it extends a distance of 75 feet or more from the hole. The use of explosives is then discontinued, and a water-tight connection to the hole is made by fastening a piece of iron pipe in the hole with melted sulphur. To this connection is attached an ordinary hand...
Seite 65 - ... originate mainly as deposits of calcareous mud from the breaking up of shells, corals, and the remains of other marine animals on an old sea bottom. Those of the third group result from the breaking up of older rocks, and the accumulation on the bottom of lakes and seas of the resultant sand, clay, or mud in beds of varying thickness, to be subsequently hardened into stone. " Now the essential difference between a marble and a compact common limestone, like those of Ohio or Kansas, is that the...
Seite 65 - The majority of stones used for any form of structural or decorative work may be roughly classed under three heads: (1) The crystalline siliceous rocks, including the granites, gneisses and diabases, or traprocks; (2) the calcareous rocks, including all limestones and dolomites, both the crystalline and compact common varieties; and (3) the f ragmental or clastic rocks, including the sandstone and clay slates.