...capable of scratching glass with facility; if re-heated to redness, and once more left to cool slowly, it again becomes nearly as soft as ordinary iron, and, between these two conditions, any required degree of hardness may be attained. The articles, forged into shape, are first...

...capable of scratching glass with facility ; if re-heated to redness, and once more left to cool slowly, it again becomes nearly as soft as ordinary iron, and, between these two conditions, any required degree of hardness may be attained. The articles, forged into shape, are first...

...capable of scratching glass with facility: if reheated to redness, and once more left to cool slowly, it again becomes nearly as soft as ordinary iron ; and between these two conditions, any required degree of hardness may be attained. The articles, forged into shape, are first...

...extremely brittle and almost perfectly elastic. By reheating the steel and allowing it to cool slowly, it again becomes nearly as soft as ordinary iron,...this temperature by observing the color of the thin film of oxyd which appears -upon the surface. Thus, a light straw color indicates the degree of heat...

...extremely brittle and almost perfectly elastic. By reheating the stoel and allowing it to cool slowly, it again becomes nearly as soft as ordinary iron,...these two extremes any required degree of hardness may bo attained. In working steel, the articles are first finished in a soft state, and afterward hardened;...

...extremely brittle and almost perfectly elastic. TSy reheating the steel aud allowing it to cool slowly, it again becomes nearly as soft as ordinary iron,...this temperature by observing the color of the thin film of oxyd which appears upoa the surface. Thus, a light straw color indicates the degree of heat...

...extremely brittle and almost perfectly elastic. By reheating the steel and allowing it to cool slowly, it again becomes nearly as soft as ordinary iron,...this temperature by observing the color of the thin film of oxyd which appears upon the surface. Thus, a light straw color indicates the degree of heat...

...capable of scratching glass with facility: if reheated to redness, and once more left to cool slowly, it again becomes nearly as soft as ordinary iron ; and between these two conditions, any required degree of hardness may be attained. The articles, forged into shape, are first...

...capable of scratching glass with facility : if reheated to redness, and once more left to cool slowly, it again becomes nearly as soft as ordinary iron ; and between these two conditions, any required degree of hardness may be attained. The articles, forged into shape, are first...

...capable of scratching glass with facility ; if reheated to redness, and once more left to cool slowly, it again becomes nearly as soft as ordinary iron ; and between these two conditions any required degree of hardness may be attained. The articles, forged into shape, are first...