. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . General View of the Side View of the Dock with Ore Cars on the Structure. Fig. 234. — Great Northern Railway Ore Dock at Allouez Bay, Superior, Wis.(From Science Conspectus.) INFLUENCE OF DETAIL OF MANUFACTURE of the Lake Superior ore Figs. 230 to 234 illustrate some of the featuresindustry. Figs. 230 and 231 show themethod of mining the ore by steamshovels employed in northern Minne-sota. The shovels are large, withabout 5-ton dippers. The amount ofstripp
. Steel rails; their history, properties, strength and manufacture, with notes on the principles of rolling stock and track design . General View of the Side View of the Dock with Ore Cars on the Structure. Fig. 234. — Great Northern Railway Ore Dock at Allouez Bay, Superior, Wis.(From Science Conspectus.) INFLUENCE OF DETAIL OF MANUFACTURE of the Lake Superior ore Figs. 230 to 234 illustrate some of the featuresindustry. Figs. 230 and 231 show themethod of mining the ore by steamshovels employed in northern Minne-sota. The shovels are large, withabout 5-ton dippers. The amount ofstripping required at these mines isoften heavy, amounting in some casesto as much as 100 feet and costingfrom $ to $ per cubic yard ofmaterial removed from on top of thebed of ore. It is generally consideredprofitable to strip up to a maximumdepth which does not exceed the thick-ness of the layer of ore uncovered. Figs. 232, 233, and 234 show theore docks and the type of vessels usedin transporting the ore. * Down tolate in the fifties the ore product ofLake Superior was handled over amule-tram road to Marquette, and aslate as 1870 a 700-ton ship w
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