Scientific American Supplement, No. 717, September 28, 1889

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Author: Various Authors
Published: 1889
Language: English
Wordcount: 43,738 / 134 pg
Flesch-Kincaid Reading Ease: 63.6
LoC Category: Q
Downloads: 378
Added to site: 2006.02.13
mnybks.net#: 12689
Genre: Science
Excerpt

power formerly wasted in vibrating the stern is utilized in propelling the vessel. In spite of all these improvements I have mentioned, there remains the serious question of defects in the material, due to variety of quality and the extreme care that has to be exercised in all the stages during construction of crank or other shafts built of iron. Many shafts have given out at sea and been condemned, through no other cause than original defects in their construction and material.

The process of welding and forging a crank shaft of large diameter now is to make it up of so many small pieces, the best shafts being made of what is termed scrap, representing thousands of small pieces of selected iron, such as cuttings of old iron boiler plates, cuttings off forgings, old bolts, horseshoes, angle iron, etc., all welded together, forged into billets, reheated, and rolled into bars. It is then cut into lengths, piled, and formed into slabs of suitable size for welding up into the sh

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