A Text-book of Ore and Stone MiningGriffin, 1897 - 744 Seiten |
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Seite 3
... thick masses of superincumbent strata . One class of crystalline rocks has given rise to much contro- versy , viz . , the rocks in which the crystals of the constituent minerals are arranged in roughly parallel layers . The rock has a ...
... thick masses of superincumbent strata . One class of crystalline rocks has given rise to much contro- versy , viz . , the rocks in which the crystals of the constituent minerals are arranged in roughly parallel layers . The rock has a ...
Seite 5
... thick . The principal bed of slate at the Oakeley Quarry , Festiniog , is 120 feet thick ( 36.5 m . ) . FIG . I. SHALE -LIMESTONE It must not be supposed that the thickness of a bed necessarily remains uniform . Occasionally this is the ...
... thick . The principal bed of slate at the Oakeley Quarry , Festiniog , is 120 feet thick ( 36.5 m . ) . FIG . I. SHALE -LIMESTONE It must not be supposed that the thickness of a bed necessarily remains uniform . Occasionally this is the ...
Seite 7
... thick , called the lode , is traversed by sundry fissures and passes without any distinct walls or boundaries into non - stanniferous granite ; sometimes the main fissure is a few inches wide filled with crystallised quartz and other ...
... thick , called the lode , is traversed by sundry fissures and passes without any distinct walls or boundaries into non - stanniferous granite ; sometimes the main fissure is a few inches wide filled with crystallised quartz and other ...
Seite 13
... thick , parallel to the planes of stratification of the enclosing slate , and full of small cubical crystals of iron pyrites . Their dip is nearly vertical , and they can be traced for miles . When a quartz vein crosses an " indicator ...
... thick , parallel to the planes of stratification of the enclosing slate , and full of small cubical crystals of iron pyrites . Their dip is nearly vertical , and they can be traced for miles . When a quartz vein crosses an " indicator ...
Seite 26
... thick- ness and usually under a seam of coal . The coal is often too thin to be worked and may be only 1 inch thick , but both coal and the underlying fire - clay may be worth working together . Various beds of clay of Secondary and ...
... thick- ness and usually under a seam of coal . The coal is often too thin to be worked and may be only 1 inch thick , but both coal and the underlying fire - clay may be worth working together . Various beds of clay of Secondary and ...
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Häufige Begriffe und Wortgruppen
adit attached belt boring Boryslaw bottom bucket cage carbonic acid carried cast-iron cent clay coal compressed air Comstock lode copper Cornwall crushed cylinder Davy lamp deposit depth district drawn drill driven drum employed engine excavation explosives feet fire-damp galena gold ground gypsum holes horizontal inches in diameter inclined Inst iron pyrites ironstone ladders lamp limestone lode lower machine machinery magnetic main rod Mansfeld Mechernich metal method metres mineral mines ordinary ozokerite particles passes phosphate piece pipe piston plate plunger pressure produced pulley pumping quantity quarries quartz revolving rock roof rope sandstone SCALE screw separate shaft shale side sieve sinking slate sometimes specific gravity steam steel stone stroke sulphur surface thick timber tube tunnel underground valve veins ventilation vertical waggon washing wheels whilst winding wire wire rope wooden yards
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Seite 53 - KNOW YOUR OWN SHIP. BY THOMAS WALTON, NAVAL ARCHITECT. Specially arranged to suit the requirements of Ships' Officers, Shipowners, Superintendents, Draughtsmen, Engineers, and Others. This work explains, in a simple manner, such important subjects as: — Displacement. — Deadweight.— Tonnage.— Freeboard. —Moments. — Buoyancy.— Strain Structure.— Stability.— Rolling.— Ballasting. — Loading. — Shifting Cargoes. — Admission of Water.— Sail Area.
Seite 43 - The Micro-Structure of Metals and Alloys. — Economic Considerations. " No English text-book at all approaches this in the COMPLETENESS with which the most modern views on the subject are dealt with. Professor Austen's volume will be INVALUABLE, not only to the student, but also to those whose knowledge of the art is far advanced.
Seite 31 - I. — ALKALIES AND ALKALINE EARTH METALS : Magnesium, Lithium, Beryllium, Sodium, Potassium, Calcium, Strontium, Barium, the Carbides of the Alkaline Earth Metals. PART II. — THE EARTH METALS: Aluminium, Cerium, Lanthanum, Didymium. PART III. — THE HEAVY METALS: Copper, Silver, Gold, Zinc and Cadmium, Mercury, Tin, Lead, Bismuth, Antimony, Chromium, Molybdenum, Tungsten, Uranium, Manganese, Iron, Nickel, and Cobalt, the Platinum Group. " COMPREHENSIVE and AUTHORITATIVE ... not only FULL of VALUABLE...
Seite 9 - We are of opinion, therefore, that the term as used in the acts of Congress is applicable to any zone or belt of mineralized rock lying within boundaries clearly separating it from the neighboring rock.
Seite 33 - NYSTROM'S POCKET-BOOK OF MECHANICS AND ENGINEERING. Revised and Corrected by W. DENNIS MARKS, Ph.B., CE (YALE SSS), Whitney Professor of Dynamical Engineering, University of Pennsylvania. Pocket Size. Leather, 155.
Seite 38 - was designed by Professor KANJUNE at an OOCTION to the above Series of Manuals. PROF. RANKINB'S WORKS— (Continued). VII. MISCELLANEOUS SCIENTIFIC PAPERS. Royal 8vo. Cloth, 31s. 6d. Part I. Papers relating to Temperature, Elasticity, and Expansion of Vapours, Liquids, and Solids. Part II. Papers on Energy and its Transformations. Part III. Papers on Wave-Forms, Propulsion of Vessels, &c.
Seite 16 - GENERAL CONTENTS. — The Materials of the Earth — A Mountain Hollow —Down the Valley — Along the Shore — Across the Plains — Dead Volcanoes —A Granite Highland— The Annals of the Earth— The Surrey Hills— The Folds of the Mountains. "The FASCINATING ' OpEN-AlK STUDIES' Of PnOF. OOLE give the subject a GLOW OF ANIMATION . . . cannot fail to arouse keen interest in geology."— Geological Magazine.
Seite 8 - All but the simplest explanations have, therefore, been avoided, and ANSWERS to the Exercises are given. Any person may readily, by careful study, become master of their contents, and thus lay the foundation for a further mathematical course, if desired. It...
Seite 17 - Management. PART II. — SEWAGE DISPOSAL WORKS IN OPERATION— THEIR CONSTRUCTION, MAINTENANCE, AND COST. Illustrated by Plates showing the General Plan and Arrangement adopted in each District.