"Yeah. About what I thought--only it runs lighter in gold, with a higher percentage of copper. It'll pay to go on and see what's at bed rock. If the copper holds up to this all along, we'll be figuring on the gold to pay for getting the copper. This is copper country, Bud. Looks like we'd found us a copper mine." He turned and walked on beside Bud. "I dug in to quite a rich streak of sand while you was gone," he volunteered after a silence. "Coarse gold, as high as fifteen cents a pan.英文原著 · 《Cabin Fever》
"With the battery prepared as above, and the solution of sulphate of copper in a vessel of proper dimensions to receive your plate, connect the galvanic current, and immerse the impressioned plate, letting it remain until a thin film of copper has been formed, then the battery can be strengthened, and the impression will be of sufficient thickness to be removed in from eight to twelve hours. An old Daguerreotype plate attached to the opposite pole of the battery (copper side towards the face of the plate to be electrotyped), will answer the same purpose as the silver-plate.英文原著 · 《American Hand Book of the Daguerreotype》
In the month of September, 1765, when I visited the copper works at Awested, one of the workmen, for a little drink money, took some of the melted copper in his hand, and after showing it to us, threw it against the wall. He then squeezed the fingers of his horny hand close together, put it for a few minutes under his armpit, to make it sweat, as he said; and, taking it again out, drew it over a ladle filled with melted copper, some of which he skimmed off, and moved his hand backwards and forwards, very quickly, by way of ostentation.英文原著 · 《The Miracle Mongers》
They make nets to take their fish of the fin of a whale; they do all their things very artfully, and it should seem that these simple, thievish islanders have war with those of the main, for many of them are sore wounded, which wounds they received upon the main land, as by signs they gave us to understand. We had among them copper ore, black copper, and red copper; they pronounce their language very hollow, and deep in the throat; these words following we learned from them:-英文原著 · 《Voyages in Search of the North-West Passage》
When the others started homeward, I followed. I did not mind their calling me lazy, nor that my father gave me only one tarnished copper cent, while Lida received two or three bright ones. I had had what I wanted most. I would rather sit under the apple-trees and hear the birds sing than have a whole handful of bright copper pennies. It was well for my father and his garden that his other children were not like me.英文原著 · 《A New England Girlhood》
On the 4th of March, 1851, Neipce, St. Victor, a former partner of DAGUERRE, announced that he had produced "all the colors by using a bath of bichloride of copper, and that a similar phenomenon occurs with all salts of copper, mixed with chlorine."英文原著 · 《American Hand Book of the Daguerreotype》
If we were at a copper-plated jewelry sale, I'd let you take the wheel.美剧 · 《2 Broke Girls》