A few secrets of the metallurgist simply told

TRANSCRIBER’S NOTE
Some minor misspellings in the text are silently corrected.
The numbering of the drawings does not correspond to their marked number. However, they have been left as they are, as the author has entered them by hand in the drawings.
In the table on the color of the oxide layer of tempered steel in the tempering section, the first column has been set without trailing commas, as the author has handled this inconsistently.
The new original cover art included with this eBook is granted to the public domain.
A FEW SECRETS OF THE
METALLURGIST
SIMPLY TOLD
ATLAS CRUCIBLE STEEL CO.
PUBLISHERS
DUNKIRK, N. Y.
GERALD W. HINKLEY, M. E.