A Text-book of Ore and Stone MiningGriffin, 1897 - 744 Seiten |
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Seite 83
... separate seams , from 6 to 25 feet ( 2 to 8 m . ) each , by partings of barren rock . As a rule , a bed less than 5 feet ( 1.50 m . ) in thickness is not worth working , unless it is exceptionally rich or conveniently situated for ...
... separate seams , from 6 to 25 feet ( 2 to 8 m . ) each , by partings of barren rock . As a rule , a bed less than 5 feet ( 1.50 m . ) in thickness is not worth working , unless it is exceptionally rich or conveniently situated for ...
Seite 112
... discovering minerals by boring is a subject of so much importance that it requires a separate chapter . A Treatise on Mine Surveying . London , 1891 , p . 261 . CHAPTER III . BORING . Uses of bore - holes II2 ORE AND STONE - MINING .
... discovering minerals by boring is a subject of so much importance that it requires a separate chapter . A Treatise on Mine Surveying . London , 1891 , p . 261 . CHAPTER III . BORING . Uses of bore - holes II2 ORE AND STONE - MINING .
Seite 116
... separate rods are joined , as shown in Fig . 97 , by screwed spigot and socket connections which are riveted on . The short topmost piece of rod b ( Fig . 98 ) , carries the chamber c , at the base of which the head of b can revolve ...
... separate rods are joined , as shown in Fig . 97 , by screwed spigot and socket connections which are riveted on . The short topmost piece of rod b ( Fig . 98 ) , carries the chamber c , at the base of which the head of b can revolve ...
Seite 121
... separate drill rod is 10 feet long . The total weight of the machine is about four tons . The new Victorian Giant Drill , said to be the largest and most powerful drill in Australia , contains some improvements suggested by experience ...
... separate drill rod is 10 feet long . The total weight of the machine is about four tons . The new Victorian Giant Drill , said to be the largest and most powerful drill in Australia , contains some improvements suggested by experience ...
Seite 125
... separate piece fastened by gibs and cotters to the tool carrier ( Fig . 118 ) . In boring larger holes the chisel is made of two , three , or four separate blades . Boring Rods . - The boring rods are made of iron of square section ...
... separate piece fastened by gibs and cotters to the tool carrier ( Fig . 118 ) . In boring larger holes the chisel is made of two , three , or four separate blades . Boring Rods . - The boring rods are made of iron of square section ...
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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.