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Mining and Metallurgy: Published Monthly by the ..., Випуски 85 – 90
Повний перегляд - 1914
Mining and Metallurgy: Published Monthly by the ..., Випуски 97 – 102
Повний перегляд - 1915
amount appear average bedding carbon carried cast cast-iron cause cementite cent coal concentration containing cooling copper cost crystals deposits determined diameter direction discussion district effect ENGINEERS evidence experiments fact feed furnace galena give given gold grains granite graphite heat important increased indicate ingot iron Kaffirs known labor later length less lignite limestone lower mass material means metal method miles mill minerals mines natives obtained occur operation original pass pegmatite percentage pipe plant practice present probably pulsion pure pyrite quantity quartz rails Ratio reason region river rocks samples sand seems separation shown side silver South steel structure suction sulphide sulphur supply surface Table taken temperature tests tion tons usually veins York
Сторінка 1088 - ... Foreign Economic Administration, who shall serve as Chairman, the Secretary of State, and three persons appointed by the President of the United States by and with the advice and consent of the Senate. The Secretary of State, to such extent as he deems it advisable, may designate to act for him in the discharge of his duties as a member of the Board of Directors any officer of the Department of State who shall have been appointed by and with the advice and consent of the Senate.
Сторінка 186 - The first stage of pronounced alteration is the disintegration of the firm rock into a mass of hard, angular fragments, varying in size from that of a bean to that of a human fist, which apparently do not readily disintegrate on exposure to the weather. The second stage of alteration, due to further weathering, yields a compact mass, the so-called "green ground," showing various shades of light olive green, often bluish in tint when moist, but becoming yellowish on drying.
Сторінка 314 - Price 5 cents. 17. On the Development of Crystallization in the Igneous Rocks of Washoe, Nevada, with Notes on the Geology of the District, by Arnold Hague and Joseph P. Iddings. 1885. 8°.
Сторінка 610 - Iron containing so much carbon or its equivalent that it is not malleable at any temperature. The committee recommends drawing the line between cast iron and steel at 2.20 per cent carbon. Cast Steel. — The same as crucible steel; obsolete, and confusing; the terms " crucible steel " or " tool steel
Сторінка 1149 - ... June, 1908. SUMMARY. The results to date on this series of tests confirm the conclusion set forth in the summary of Bulletin No. 17 by Prof. SW Parr and Mr. Hamilton, except that 4 per cent seems to be amply sufficient to cover the losses sustained by Illinois coals under regular storage conditions, the larger losses indicated in the former series being probably due to the small size of the samples exposed as against car-load lots in the present series. In these latter tests, the losses sustained...
Сторінка 1011 - Its soft ore, now nearly all mined out either by surface trenches or slopes, is the best in the district. Its hard ore is also of high grade and hitherto has been for the most part held in reserve, since ore could be produced from the thicker Big seam at a lower cost per unit of iron. The structure and composition of the Big and Irondale seams...
Сторінка 1011 - About the middle of the district the seam becomes separated into two benches, either by a well-defined parting along the bedding plane or by a shale bed, thin at first, but thickening gradually to the southwest. The middle of the Big seam is the workable part in the northeast end of the district, but the upper bench is of most importance throughout the rest of the area. In the southwest portion of the district the lower bench, which farther northeast is composed of ore that...
Сторінка 1168 - In consideration of the confidence which he invokes and expects, notwithstanding the fact that he has been paid by interested parties, he assumes a sacred trust, obligating him to safeguard the interests of a wider and more important clientage. ' The investor has not the time, and perhaps not the technical knowledge, required for the thorough study of a prospectus. He risks his money upon his belief in the ability and integrity of the engineer, who is therefore bound in prudence and in honor to be...