French Silver
The new French silver is apparently an improvement on the oldfashioned German silver, and it is stated to be applicable to all the purposes to which ordinary commercial silver is applicable. It is composed of copper, 56 per cent., nickel, 40.64, tungsten, 2.0, aluminum, 0.56. It is a white, ductile, malleable, tenacious, sonorous alloy; its specific gravity is nine-tenths that of silver, its metallic lustre superior to that of sil- , its metallic lustre superior to that of silver, and its fusibility less, probably on account of the tungsten it contains. less costly, would replace red and yellow This alloy has found a ready market, and, if brass . Its hardness and tenacity render it peculiarly adapted for the journals and bearuses it for a journal for a polishing disk, ings of machinery. Christofle, of Paris, who found that it lasted six times longer than ordinary journals-that is, 18 months. There were 2200 revolutions made per minute. It journal of this new bronze, which was emis further stated, on good authority , that a ployed for the axle of a sewing machine, making 240 revolutions per minute, did excellent service for 1 year without indicating the least deficiency. Journals of ordinary bronze do not, as is well known, last over 5 months.
When more than 10 per cent. of aluminum enters into the composition of the bronze, the alloy alloy gradually becomes weaker and less maland at length so brittle that it is easily pounded in a mortar. material is manufactured largely in the United