The groaning captive wastes his life away,
For ever exil’d from the realms of day;
While, all forlorn and sad, he pines in vain
For scenes he never shall possess again.”
Mercury is raised in such abundance in Spain, that in the year 1717 there remained above 1,200 tons of it in the magazines at Almaden, after the necessary quantity had been exported to Peru for the use of the silver mines there. The quicksilver mines of Idria, a town in the circle of Lower Austria, have been wrought constantly for 300 years, and are thought on the average to yield above 100 tons of quicksilver annually. Mercury is found also in Hungary and China; it occurs most commonly in argillaceous schistus, lime-stones, and sand-stones. It is likewise found in Sweden, amalgamated with silver, and frequently combined with sulphur. Running mercury is seen in globules, in some earths and stones in America, and is collected from the clefts of rocks. Cinnabar, or sulphuret of mercury, is also generally found in those countries which produce the fluid metal.[108]
Copper is of a red color, very sonorous and elastic, and the most ductile of all metals, except gold. A wire 1-10th of an inch will support near 300 pounds. Its specific gravity is 8.66. It will not burn so easily as iron; which is evident from its not striking fire by collision. Copper-mines have been worked in China, Japan, Sumatra, and in the north of Africa. Native copper is generally found in Siberia, Sweden, Hungary, and some parts of France. Copper is found in several parts of England and Wales, particularly in Cornwall, and the Isles of Man and Anglesea. The copper pyrites found in Cornwall are sulphuret of copper. Anglesea formerly yielded more than twenty thousand tons of copper annually: the vein of metal was originally more than seventy feet thick. Copper mines have not been worked in England above 160 years. Before that period, whenever the workmen met with copper ore in the tin mines of Cornwall, they threw it aside as useless, no English miner at that time knowing how to reduce it to a metallic state. To chemical science, therefore, we are indebted for such an ample supply of this valuable metal. It is asserted, that a large copper mine has been worked for some time in the state of New-Jersey in America, and that the ore raised there is brought to this country to be smelted. Native oxides of copper are found in Cornwall and in South America. Carbonate of copper occurs as a natural production in two varieties, called malachite and mountain green. Sulphate of copper, of a very rich quality, is also found in the state of Connecticut. The stream in its course destroys vegetation; and where it settles in places near the spring, large lumps of metallic salt are collected. Bishop Watson relates, that the waters which issue from the copper mines in the county of Wicklow, in Ireland, are so impregnated with sulphate of copper, that one of the workmen having accidentally left a shovel in this water, found it some weeks after so incrusted with copper, that he imagined it was changed into copper. The proprietors of the mines, in pursuance of this hint, made proper receptacles for the water, and now find these streams of as much interest to them as the mines. When miners wish to know whether an ore contains copper, they drop a little nitric acid upon it; after a short time they dip a feather into the acid, and then wipe it over the polished blade of a knife; and if there be the smallest quantity of copper in it, the copper will be precipitated on the knife.[109] A mass of native copper has been found in a valley in the Brazils, containing 2,666 pounds weight. The description of it in the Memoirs of the Royal Academy of Sciences at Lisbon is said to be very interesting, as the largest specimen ever found before this weighs only ten pounds. In the museum of the Academy of Sciences at St. Petersburgh, is a piece of native malleable copper of extraordinary magnitude, found on the copper island lying to the east of Kamschatka.[110] The Romans were acquainted with this metal; for the only money used by that people, till the 485th year of their city, was made of it, when silver began to be coined. In Sweden, houses are covered with copper.[111]
Iron is of a livid blueish color, and one of the hardest and most elastic of all metals. When dissolved, it has a nauseous styptic taste, and being strongly rubbed emits a peculiar smell. It is attracted by the magnet, and has the property of becoming itself magnetic. It is fused with great difficulty, but gives fire by collision with flint. An iron wire only one-tenth of an inch in diameter, will carry a weight of 450 pounds without breaking; and a wire of tempered steel, of the same size, will carry one of about 900 pounds. Iron becomes softer by heat, and has capability of being welded to another piece of the same metal so as to form one entire mass; and this may be done without melting either of the pieces. No other metal, except platina, possesses this singular properly, which renders it most suitable for every common purpose. Its specific gravity varies from 7.6 to 7.8.
This valuable metal is plentifully diffused throughout nature, pervading almost every thing, so as to be detected even in plants and animal fluids, and is the chief cause of color in earths and stones. It is found in large masses, and in various states, in the bowels of the earth. In the museum of the Academy of Sciences at Petersburgh is a mass of native iron twelve hundred pounds weight. In the northern parts of the world whole mountains are formed of iron ore, and many of these ores are magnetic. Of the English ores, the common Lancashire hematite produces the best iron. This metal is found in solution in many natural springs, and gives the character to all our chalybeate waters: besides which, there are some springs which contain iron in combination with sulphuric acid. These are called vitriolated waters. There are several in this land; but those at Chadwell near London, and at Swansea in Glamorganshire, are probably the most important.
As this metal possesses so many properties, exists in so many different states, and is capable of being applied to such a variety of excellent purposes, it is certainly the most useful of all the products of the mineral kingdom. It was used in the time of Moses, in whose writings Canaan is mentioned as “a land whose stones were iron.” The Greeks understood the method of tempering it. Homer, in the ninth book of his Odyssey, describes the fire-brand driven into the eye of Polyphemus, as hissing like hot iron immersed in water. The advantages which we derive from the magnetic property of iron are incalculable. To this we are indebted for the mariner’s compass, by which man is enabled to traverse the ocean, open a friendly or commercial intercourse with every quarter of the globe, and to steer his course with the utmost accuracy.
“Tall navies hence their doubtful way explore,