Aids in Practical GeologyC. Griffin, 1902 - 431 Seiten |
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Seite 20
... commonly regarded as cleavage - planes , these secondary surfaces of weak- ness being marked by a pearly or sub - metallic lustre . The shimmering surfaces of broken diallage , ordinary bronzite , murchisonite , & c . , are due to this ...
... commonly regarded as cleavage - planes , these secondary surfaces of weak- ness being marked by a pearly or sub - metallic lustre . The shimmering surfaces of broken diallage , ordinary bronzite , murchisonite , & c . , are due to this ...
Seite 49
... commonly supplied are far too thin ; 5 mm . is a good thickness . The glass is then held between the eye and the flame that is to be tested , and the reddish - violet inge due to potassium may be observed through it , particularly when ...
... commonly supplied are far too thin ; 5 mm . is a good thickness . The glass is then held between the eye and the flame that is to be tested , and the reddish - violet inge due to potassium may be observed through it , particularly when ...
Seite 50
... commonly met with and can be fully relied on are here given . Many substances give beads that are yellow when hot and colourless when cold , or make opaque porcellanous beads when added in large quantity ; but their constituents can ...
... commonly met with and can be fully relied on are here given . Many substances give beads that are yellow when hot and colourless when cold , or make opaque porcellanous beads when added in large quantity ; but their constituents can ...
Seite 72
... Commonly associated with some carbonate of zinc , which effervesces . 43. Hornblende . ( Mg , Ca , Fe ) Si Og , with some Al , O , and Fe2O3 . * Like augite . Prism - angle , however , 124 ° . Frequently in elongated prisms and even ...
... Commonly associated with some carbonate of zinc , which effervesces . 43. Hornblende . ( Mg , Ca , Fe ) Si Og , with some Al , O , and Fe2O3 . * Like augite . Prism - angle , however , 124 ° . Frequently in elongated prisms and even ...
Seite 75
... Commonly a little water . Evolves oxygen , a glowing splinter of wood inserted in tube being re - kindled as each puff of gas arises . Add . — Soluble in H Cl with evolution of chlorine , which is known by its smell . 2 68. Pyromorphite ...
... Commonly a little water . Evolves oxygen , a glowing splinter of wood inserted in tube being re - kindled as each puff of gas arises . Add . — Soluble in H Cl with evolution of chlorine , which is known by its smell . 2 68. Pyromorphite ...
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Häufige Begriffe und Wortgruppen
abundant acid altered amphibole andesites angle appear aragonite areas assay augite axis basal bead become biotite blue brown calcareous calcite carbonate Carboniferous cavities character cleavage cobalt colour colourless common commonly compact constituents Cretaceous crossed nicols crystalline crystals dark decomposed deposits developed Devonian elongated encrustation eurites felspar fibrous flame foliated forms fossils fragments garnet Geol glass Gotlandian grains granite granular granules green groundmass H Cl hinge-line hornblende igneous rocks iron Journ Jurassic lavas leucite limestones lithoidal magnetite margin marked mass mica microscope minerals minute nepheline occur olivine opaque ophitic optic ordinary Ordovician orthoclase oxide pale parallel Plagioclase planes plates pleochroism polarised porphyritic posterior powder prismatic prisms pyroxene quartz radial reaction Refr refractive resemble rhombic rhyolites schists sections seen septa serpentine shell silica soda sometimes specific gravity specimens spherulites spicules structure sulphur surface thick trace trachytic tube types typical umbo ventral
Beliebte Passagen
Seite 63 - 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 33 - TRAVERSE TABLES: Computed to Four Places of Decimals for every Minute of Angle up to 100 of Distance. For the Use of Surveyors and Engineers. BY RICHARD LLOYD GURDEN, Authorised Surveyor for the Governments of New South Wales and Victoria, *»* Published with the Concurrence oj the Surveyors- General for New South Wales and Victoria. "Those who have experience in exact SURVEY-WORK will best know how to appreciate the enormous amount of labour represented by this valuable book.
Seite 35 - A MANUAL OF APPLIED MECHANICS : Comprising the Principles of Statics and Cinematics, and Theory of Structures, Mechanism, and Machines. With Numerous Diagrams. Crown 8vo, cloth, 12s. 6d. FOURTEENTH EDITION. II. A MANUAL OF CIVIL ENGINEERING : Comprising Engineering Surveys, Earthwork, Foundations, Masonry, Carpentry, Metal Work, Roads, Railways, Canals, Rivers, Waterworks, Harbours, &c.
Seite 27 - GENERAL CONTENTS. Historical and Discursive. — Dock Design. — Constructive Appliances. — Materials. — Dock and Quay Walls. — Entrance Passages and Locks. — Jetties, Wharves, and Piers. — Dock Gates and Caissons. — Transit Sheds and Warehouses. — Dock Bridges. — Graving and Repairing Docks. — Working Equipment of Docks. — INDEX. " We have never seen a more profusely-illustrated treatise. It is a most important standard work, and should be in the hands of all dock and harbour...
Seite 72 - Barrister-at-Law, Public Analyst for the County of Devon, and Medical Officer of Health for St. Marylebone. AND M. WYNTER BLYTH, BA, B.Sc., FCS GENERAL CONTENTS. — History of Adulteration. — Legislation. — Apparatus. —
Seite 40 - Examinations — Rise and Progress of Steam Propulsion — Development of Free Trade— Shipping Legislation, 1862 to 1875— " Locksley Hall" CaseShipmasters' Societies — Loading of Ships — Shipping Legislation, 1884 to 1894 — Statistics of Shipping.
Seite 63 - CONTENTS.— The Relation of Metallurgy to Chemistry. — Physical Properties of Metals. — Alloys. — The Thermal Treatment of Metals. — Fuel and Thermal Measurements. — Materials and Products of Metallurgical Processes. — Furnaces. — Means of Supplying Air to Furnaces.
Seite 76 - University College. Aberystwyth ; Examiner in Zoology, University of Aberdeen. " It would be hard to find a Text-book which would better guide the student to an accurate knowledge of modern discoveries in Botany. . . . The SCIENTIFIC ACCURACY of statement...
Seite 28 - Experiments on English and Foreign Boilers with their Heat Efficiencies shown in Fifty Tables — Fire Grates of Various Types — Mechanical Stokers — Combustion of Fuel in Boilers — Transmission of Heat through Boiler Plates, and their Temperature — Feed Water Heaters, Superheaters, Feed Pumps, &c. — Smoke and its Prevention — Instruments used in Testing Boilers — Marine and Locomotive Boilers — Fuel Testing Stations — Discussion of the Trials and Conclusions — On the Choice of...
Seite 85 - SKETCHES OF BRITISH BIRDS IN THEIR HAUNTS. BY CHARLES DIXON. The Spacious Air. — The Open Fields and Downs. — In the Hedgerows.— On Open ; Heath and Moor. — On the Mountains. — Amongst the Evergreens. — Copse and Woodland. — By Stream and Pool. — The Sandy Wastes and Mudflats.— Sea-laved Rocks.— Birds of the Cities.— INDEX. "Enriched with excellent illustrations. A welcome addition to all libraries.