OCR Text |
Show Diseases of Metals. Metals suffer from contagious diseases dis-eases analogous to thoso of living beings. Among these dlsoasos ono of tho most striking Is that called "tin pest." Sometimes a block, pinto or medal of tin attacked by this dlsoaso mumbles and falls , Into tlust, and uometlmes warty protuborances appear ap-pear on tho surfaco of tho metal. Various other metals Buffer from a dlsoaso that manifests itself by a spontaneous recrystalllzajlon. Tho most remarkable cases occurwlth lead and hnrd drawn brass. Theso diseases dis-eases aro noLdue, as lino boon thought, simply to moisture. Tcmpor-aturo Tcmpor-aturo plays a part in producing thqm Tho most extraordinary fact perhaps Is that tho "tin pest" Is capable of spreading by contagion. Ilarper'1 Weokly. |