A Text-book of Ore and Stone MiningGriffin, 1897 - 744 Seiten |
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Seite 128
... drawn up by a hand or a steam windlass , the retaining key is put under a shoulder , and the joint unscrewed by another key . It is well to have as many caps as there are lengths to be drawn up , and then each length can be suspended in ...
... drawn up by a hand or a steam windlass , the retaining key is put under a shoulder , and the joint unscrewed by another key . It is well to have as many caps as there are lengths to be drawn up , and then each length can be suspended in ...
Seite 132
... drawn up to the surface . In order that the direction of the dip may be ascertained from the core , it is necessary to know exactly how it stood when it was 7 . in situ . In Victoria the rods and the core 132 ORE AND STONE - MINING .
... drawn up to the surface . In order that the direction of the dip may be ascertained from the core , it is necessary to know exactly how it stood when it was 7 . in situ . In Victoria the rods and the core 132 ORE AND STONE - MINING .
Seite 134
... drawn up , the core is then extracted , and by means of the ink marks the compass can be put upon the core in precisely the same position as it originally occupied in the hole . Instead of using ink marks , some plastic material such as ...
... drawn up , the core is then extracted , and by means of the ink marks the compass can be put upon the core in precisely the same position as it originally occupied in the hole . Instead of using ink marks , some plastic material such as ...
Seite 136
... drawn up , and the valve is opened to discharge the sludge . In consequence of the light- ness of the rods , the conicity of the screw joints , and the skill of the workmen , the various boring operations are carried on with surprising ...
... drawn up , and the valve is opened to discharge the sludge . In consequence of the light- ness of the rods , the conicity of the screw joints , and the skill of the workmen , the various boring operations are carried on with surprising ...
Seite 150
... drawn up . The line of etching records what was the horizontal plane when the cylinder was in the bore - hole , and the angle between it and the flat bottom measures the deviation from the vertical . Trouvé has designed an electric lamp ...
... drawn up . The line of etching records what was the horizontal plane when the cylinder was in the bore - hole , and the angle between it and the flat bottom measures the deviation from the vertical . Trouvé has designed an electric lamp ...
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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
Beliebte Passagen
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.