Page:The chemical history of a candle.djvu/212

got out the platinum from the ore. (Having made use of your friend, you get rid of him as quickly as you can.) He gets his heat by applying the combination of oxygen and hydrogen, or of carburetted fuel, for the purpose of producing a fire. I have here a source of coal-gas; there I have a source of hydrogen; and here I have a source of oxygen. I have here also one of the blowpipes used by Deville in his process for working platinum in the way I have spoken of. There are two pipes, and Fig. 37. one of them goes to the source of coal-gas, and the other to the supply of oxygen. By uniting these we obtain a flame of such a heat as to melt platinum. You will, perhaps, hardly