Scientific amusements . Preparing lead for bullets. Chromium. This metallic element is almost un-known in the metallic state. But although little known,the beautiful colours of its compounds make it a veryinteresting study. The very name leads one to expectsomething different to the other metals—chroma, metal is procured from what is known as chrome-ironstone, a combination of protoxide of iron and sesqui-oxide of chromium (FeOCr,03). By ignition with potas-sium we get chromic acid and chromate of potassium, a: ISO CHEMISTRY. yellow salt which is used to make the other compounds ofc
Scientific amusements . Preparing lead for bullets. Chromium. This metallic element is almost un-known in the metallic state. But although little known,the beautiful colours of its compounds make it a veryinteresting study. The very name leads one to expectsomething different to the other metals—chroma, metal is procured from what is known as chrome-ironstone, a combination of protoxide of iron and sesqui-oxide of chromium (FeOCr,03). By ignition with potas-sium we get chromic acid and chromate of potassium, a: ISO CHEMISTRY. yellow salt which is used to make the other compounds ofchromium. The metal is by no means easy to fuse. Sesqui-Oxide of Chromium is a fine green powder em-ployed in painting porcelain. Chromate of Lead is termed chrome yellow, and inits varieties is employed as a Type-casting Chromate of Mercury is a beautiful vermilion. Thereare numerous other combinations which need not be men-tioned here. Antimony was discovered by Basil Valentine. TheLatin term is Stibium, hence its symbol, Sb. It is verycrystalline, and of a peculiar bluish-white tint. It willtake fire at a certain high temperature, and can be usedfor the manufacture of Bengal Lights, with nitre and ANTIMONY. I 5 I sulphur in the proportions of antimony one, the otherstwo and three respectively. The compounds of antimony are used in medicine, andare dangerous when taken without advice. They act asemetics if taken in large quantities. Our tartar emeticis well known. Antimony, in alloy with lead and a little tin, form theype metal to which we are indebted for our is done by hand, and requires much ladle is dipped into the molten metal, and the mouldjerked in to fill it properly, and then the type is removedand the mould shut ready for another type ; and a s
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Keywords: ., bookcentury1800, bookdecade189, booksubjectscientificrecreations
