Mining: An Elementary Treatise on the Getting of MineralsLongmans, Green, 1904 - 547 страници |
Между кориците на книгата
Резултати 1 - 5 от 100.
Страница xli
... means of agriculture , the earth will supply these people with everything necessary for food and clothing . At the present time there are very large areas of the world with a very scanty population . Take the case , for example , of the ...
... means of agriculture , the earth will supply these people with everything necessary for food and clothing . At the present time there are very large areas of the world with a very scanty population . Take the case , for example , of the ...
Страница xlii
... means of getting hold of electricity except by the power produced by coal or some other well - known source of power . Electrical machines and conductors are only one device out of many known to the engineer for trans- mitting power ...
... means of getting hold of electricity except by the power produced by coal or some other well - known source of power . Electrical machines and conductors are only one device out of many known to the engineer for trans- mitting power ...
Страница 2
... means , it would be necessary to use a compass with a limb equal in length to half the diameter of the earth , that is , nearly 4000 miles , but by trigonometrical calculations the use of the compasses is unnecessary , and a section of ...
... means , it would be necessary to use a compass with a limb equal in length to half the diameter of the earth , that is , nearly 4000 miles , but by trigonometrical calculations the use of the compasses is unnecessary , and a section of ...
Страница 29
... means of the collective action of the com- munity , the cost of water - pumping will be better distributed , and the total cost reduced in some cases by adits on a low level ; improved machinery may be erected for winding , for the ...
... means of the collective action of the com- munity , the cost of water - pumping will be better distributed , and the total cost reduced in some cases by adits on a low level ; improved machinery may be erected for winding , for the ...
Страница 43
... means " miner " ) . There are probably several reasons for this . One reason is at once apparent - it is that excavations made on the side of a hill can be drained with- out pumping machinery . Before the days of steam - power this ...
... means " miner " ) . There are probably several reasons for this . One reason is at once apparent - it is that excavations made on the side of a hill can be drained with- out pumping machinery . Before the days of steam - power this ...
Съдържание
64 | |
71 | |
81 | |
117 | |
125 | |
131 | |
138 | |
188 | |
203 | |
208 | |
231 | |
243 | |
286 | |
294 | |
333 | |
335 | |
364 | |
373 | |
374 | |
388 | |
397 | |
418 | |
424 | |
441 | |
481 | |
482 | |
497 | |
546 | |
Други издания - Преглед на всички
Често срещани думи и фрази
air-current air-road anemometer bars bore-hole boring bottom brattice brick cage capstan cent centre coal measures coal-dust Coal-field colliery compressed conductors cubic foot cylinder Davy lamp depth detonator dirt distance drill driven drum electric engine fire-damp flame flange foot foot-pounds friction fulminate of mercury furnace gauze ground gunpowder haulage heat hole hoppet inches in diameter incline iron ironstone lamp length lifted load lower machine Millstone Grit mineral mines minute outcrop pass Permian pillars pipe piston pit-bottom plate props pulley pump road rocks rods roof rope rule safety-lamp sandstone screw seam of coal shaft shale shown in Fig shows side sinking sometimes speed spur-gearing square inch stalls steam steel stone strata stroke surface temperature thick timber tons tubbing tube upcast valves vein velocity vertical waggons Warwickshire water-gauge wedge weight wheel wire yards
Популярни откъси
Страница 4 - INTRODUCTION TO THE STUDY OF CHEMICAL PHILOSOPHY. The Principles of Theoretical and Systematic Chemistry. With 5 Woodcuts.
Страница 36 - NOTES OF A COURSE OF NINE LECTURES ON LIGHT, delivered at the Royal Institution of Great Britain, 1869. Crown 8vo. , is. 6d. -NOTES OF A COURSE OF SEVEN LECTURES ON ELECTRICAL PHENOMENA AND THEORIES, delivered at the Royal Institution of Great Britain, 1870.
Страница 30 - DIRECTIONS FOR CLASS WORK IN PRACTICAL PHYSIOLOGY : Elementary Physiology of Muscle and Nerve and of the Vascular and Nervous Systems. By EA SCHAFER, LL.D., FRS, Professor of Physiology in the University of Edinburgh. With 48 Diagrams. 8vo., 31.
Страница 21 - Our Place among Infinities : A Series of Essays contrasting our Little Abode in Space and Time with the Infinities Around us.
Страница 36 - VOL. I. :— The Constitution of Nature— Radiation— On Radiant Heat in relation to the Colour and Chemical Constitution of Bodies— New Chemical Reactions produced by Light — On Dust and Disease — Voyage to Algeria to observe the Eclipse — Niagara — The Parallel Roads of Glen Roy — Alpine Sculpture — Recent Experiments on...
Страница 21 - Other Worlds than Ours ; The Plurality of Worlds Studied under the Light of Recent Scientific Researches.
Страница 32 - BRODIE. — THE ESSENTIALS OF EXPERIMENTAL PHYSIOLOGY. For the Use of Students. By TG BRODIE, MD, Lecturer on Physiology, St. Thomas's Hospital Medical School. With 2 Plates and 177 Illustrations in the Text. 8vo. , 6s. 6d. CHAPMAN.— -THE FORAMINIFERA : An Introduction to the Study of the Protozoa.
Страница 30 - QUAIN'S (JONES) ELEMENTS OF ANATOMY. The Tenth Edition. Edited by EDWARD ALBERT SCHAFER, FRS, Professor of Physiology in the University of Edinburgh ; and GEORGE DANCER THANE, Professor of Anatomy in University College, London. VOL. I., PART I. EMBRYOLOGY.
Страница 22 - A NEW STAR ATLAS, for the Library, the School, and the Observatory, in Twelve Circular Maps (with Two Index Plates). Intended as a Companion to 'Webb's Celestial Objects for Common Telescopes.
Страница 22 - HALF-HOURS WITH THE STARS : a Plain and Easy Guide to the Knowledge of the Constellations. Showing in 12 Maps the position of the principal Star-Groups night after night throughout the year. With Introduction and a separate Explanation of each Map. True for every Year.