Proceedings of the Engineers' Society of Western Pennsylvania, Volume 1

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Engineers' Society of Western Pennsylvania., 1889 - Assaying
 

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Page 283 - That lead and zinc may enter the tissues in this way without causing any disturbance in the growth, nutrition and functions of the plant. 3. That the compounds of copper and arsenic exert a...
Page 250 - I have asked that dreadful question of the hills, That look eternal; of the flowing streams, That lucid flow forever; of the stars, Amid whose fields of azure my raised spirit Hath trod in glory : all were dumb; but now, While I thus gaze upon thy living face, I feel the love that kindles through its beauty Can never wholly perish ; we shall meet Again, Clemanthe ! Clem.
Page 17 - Steel is entirely mercurial under the action of heat, and a careful study of the tables will show that there must of necessity be an injurious internal strain created whenever two or more parts of the same piece are subjected to different temperatures. 4. It follows that when steel has been subjected to heat not absolutely uniform over the whole mass, careful annealing should be resorted to. 5. As the change of volume due to a degree of heat increases directly and rapidly with the quantity of carbon...
Page 345 - Presidents of the American Society of Civil Engineers, the American Institute of Mining Engineers, the American Society of Mechanical Engineers, the American Society of...
Page 250 - I have asked that dreadful question of the hills that look eternal — of the clear streams that flow forever— of the stars among whose fields of azure my raised spirit has walked in glory.
Page 28 - It is said that rivulets in that county, from a spot less than 1 square mile in area, discharge their waters into streams flowing respectively to the Chesapeake Bay, the Gulf of Saint Lawrence, and the Gulf of Mexico. The area of the basin of the Allegheny is about 13,000 square miles, making at Pittsburgh very nearly two-thirds of the total area drained by (lie Ohio at that point.
Page 165 - ... wires to the machines are in use. In the first, Fig. 447, the fuses are connected in series ; that is to say, one wire of the first hole is connected to one wire of the second hole, and the other wire of the second hole to one wire of the third hole, and so on, until all are joined, when there will be one wire of the last hole and one wire of the first hole left unconnected. These are now joined by wires to the machine, which is in a place of safety. In the second, Fig. 448, the fuses are connected...
Page 280 - All substances in solution in a soil are absorbed by the roots of plants, exactly as a sponge imbibes a liquid, and all that it contains, without selection.
Page 274 - ... one inch thick, which performed all the work required. The stuffing-box wore rapidly until the following device was applied: A screw was cut in the chamber, in the opposite direction to the motion of the shaft. A pipe was put in back of the packing and connected with the piston-pump. Water was forced through this around the shaft, and, being under a greater pressure than the centrifugal pump, prevented the puddle material from getting into the stuffing box. Water so applied performed a double...
Page 44 - Thc true scientific natural basis of the metric system has been abandoned. The meter is quite as arbitrary and unscientific a standard as the foot or yard, and its compulsory adoption would derange the titles and records of every farm and every city and village lot in the United States ; would put every merchant, farmer, manufacturer, and mechanic to an unnecessary expense and trouble, and all, it seems to me, for the sake of indulging a fancy only, and a baseless fancy, of closet philosophers and...

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