ustion of our coal fields is under consideration.— tion of the thread acts with the compression of the ty, also, of properly adjusting the runner on the bed Mining Jour nal. two inclines of the jaws and the conformation of the stone, so that the contact may be even, is a serious [It is hard to… … WESTON'S IMPROVEMENT IN MILLSTONES. ceive a steel wire spring which is inserted into the stone and bolted to the plate, o. At C is a hole their subsequent combustion. Dr. Hagan's water- rear of each jaw, so that when relieved from pres- through the plate designed to admit the hand into burning…
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