. Antiche miniere sulle rive del lago Superior. Miniere di rame e minerario. Stone Maul, con doppie scanalature.-peso 36 libbre Minnesota miniera. In uno dei box un rude scala è stata trovata, formata da un albero di quercia tagliato in modo da lasciare i monconi dei rami sporgenti su cui gli uomini potrebbero facilmente scendere o salire da o per il loro lavoro. Leve di legno si trovano anche tra la spazzatura, conservate da acqua, che li ha ricoperti continuamente. Sul bordo dello scavo in cui la massa m è stata trovata vi sorgeva un età compresa tra la cicuta, le cui radici esteso attraverso la fossa. Ho contato gli anelli annuali degli g

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. Ancient mining on the shores of Lake Superior. Copper mines and mining. Stone Maul, with double grooves.—Weight 36 lbs. Minnesota Mine. In one of the pits a rude ladder was found, formed of an oak tree trimmed so as to leave the stumps of the branches projecting, on which men could readily descend or ascend to or from their work. Wooden levers are also found among the rubbish, preserved by water, which covered them continually. On the edge of the excavation in which the mass m was found there stood an aged hemlock, the roots of which extended across the ditch. I counted the rings of annual growth on its stump, and found them to be two hundred and ninety. Mr. Knapp men- tions another tree which had three hundred and ninety-five. The fallen and decayed trunks of trees of a previous generation were seen lying across the pits. Near the place where the detached mass m was found Mr. HUl discovered a tool of which the following is a sketch, and near it a copper maul or sledge weighing from twenty to twenty-five pounds. Like aU the other implements found this maul had been fashioned by pounding in a cold state. Originally the mass appeared to have had the shape of the letter T, the cross head at the top being about an inch thick and two or three inches broad, tapering towards each end. These two prongs had been folded over each other and beaten into a shape rudely resembling a man's fist, but larger. This lump of copper had evidently been battered either by pounding, to make it more compact, or by use as a maul. The handle of the maul was eight or nine inches long.. Copper Chisel. Full size.—Length 7^ 1.; breadth 1| in.; thickness f 1. Minnesota Mine. View edge- wise.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Whittlesey, Charles, 1808-1886. [Washington, Smithsonian Institution]

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1860