Posted by Paul in MN on December 22, 2009 at 07:35:46 from (71.210.130.197):
In Reply to: Trollhattan Locks posted by MarkB_MI on December 21, 2009 at 15:58:47:
Yes this is truely beautiful!
I just Googled Alfred Nobel and found his blasting cap and soon to be invented dynamite to be in the late 1860's. At that time IIRC, Norway and Sweden were one country. But it did say that the dynamite factory was located near Stockholm (east side of Sweden, whereas Norway is west of Sweden). But he created factories and held patents in many countries including the US.
Nitroglycerine (blasting oil) preceeded dynamite by about 20 years, but it was horribly unstable to transport and use. I have no idea about how it was actually used to blow rock. But stick dynamite could be inserted into drilled holes and thus could give some direction to the blasting. A lot of farmland was created by the use of dynamite to blow out the huge stumps of trees for clearing land.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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