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erent metals by fusing some metalic substance effected by laying the paper on a table, a nd holding upon them, is called soldering. It is a general rule , a double convex lens (a common s un-glass) over it, that the solder should be easier of fusion than the and then placing a mirror over the lens, in an oblimetal to be soldered by it. It is, in the next place, que position, so as to face partly towards the object desirable, though seldom absolutely necessary, nor that is to be represented. Thedoi:10.1038/scientificamerican08201846-2a fatcat:vdnt7eebknhuvdtbperkolvhem