A Text-book of Ore and Stone MiningGriffin, 1897 - 744 Seiten |
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Seite 15
... allowed to pass unchallenged , for Prof. Alfred Stelznert combats his methods of analysis . It is naturally impossible to affirm with certainty that a given mineral , such as mica , contains lead for instance , so long as there is a ...
... allowed to pass unchallenged , for Prof. Alfred Stelznert combats his methods of analysis . It is naturally impossible to affirm with certainty that a given mineral , such as mica , contains lead for instance , so long as there is a ...
Seite 24
... cleared , the moisture finds its way When the surface has up again by capillary action and is evaporated by the sun . The formation of the efflorescence is allowed to go on for three or four 24 ORE AND STONE - MINING .
... cleared , the moisture finds its way When the surface has up again by capillary action and is evaporated by the sun . The formation of the efflorescence is allowed to go on for three or four 24 ORE AND STONE - MINING .
Seite 25
Clement le Neve Foster. efflorescence is allowed to go on for three or four years , and then the new crop is scraped off . The sand is blown on by high periodical westerly winds . The question naturally arises : Why is the borax mainly ...
Clement le Neve Foster. efflorescence is allowed to go on for three or four years , and then the new crop is scraped off . The sand is blown on by high periodical westerly winds . The question naturally arises : Why is the borax mainly ...
Seite 106
... allowed to run down gently at first , and then as a torrent , which scours out a trench to the solid rock . An examination of the trench and of the stones washed out of it may result in the discovery of a vein . Piercing . In some ...
... allowed to run down gently at first , and then as a torrent , which scours out a trench to the solid rock . An examination of the trench and of the stones washed out of it may result in the discovery of a vein . Piercing . In some ...
Seite 126
... hook put in , the rods are raised by the winch , and then again allowed to fall , the master borer taking care to turn them a little each time . Fig . 114 shows the principal tools supplied by Arrault 126 ORE AND STONE - MINING .
... hook put in , the rods are raised by the winch , and then again allowed to fall , the master borer taking care to turn them a little each time . Fig . 114 shows the principal tools supplied by Arrault 126 ORE AND STONE - MINING .
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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.