Hello John Circular diamond coring bits only came into use recently. The Willamette donation was in the early 1900's. I can only assume that the saw method of the time dictated the location of the cut: large heavy frames using a wire loop with abrasives hand fed into the grove. It is not like one could easily rotate the mass easily.
I am happy to see the use of core sample extraction more frequently in sampling. However, coring has a drawback in that it is very difficult to lubricate and can heat up the core changing some magnetic states. Elton ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
