Practical blacksmithing by Richardson M.T

Author:Richardson, M.T. [ed.]
Language: eng
Format: epub
Tags: Blacksmithing
Publisher: New York, Richardson
Published: 1889-03-25T05:00:00+00:00

How Damascus Sword Blades Were Tempered.

Perhaps the best method which has ever been discovered for tempering steel, resulting in hardness, toughness and elasticity combined, is that followed in hardening the blades of the famous Damascus swords. The furnace in which the blades were heated was constructed with a horizontal slit by which a current of cold air from the outside entered. This slit was always placed on the north side of the furnace and was provided on the outside with a flat funnel-shaped attachment by which the wind was concentrated and conducted into the slit. The operation of tempering the blades was only performed on those days of winter when a cold strong north wind prevailed. The sword blade when bright red-hot was lifted out of the fire and kept in front of the slit and by this means was gradually cooled in the draft of air. It acquired the proper degree of temper at the single operation.

To Harden Steel.

A very fine preparation for making steel very hard is composed of wheat flour, salt and water, using say two teaspoonsful of water, one-half a teaspoonful of flour, and one of salt; heat the steel to be hardened enough to coat it with the paste—by immersing it in the composition—after which heat it to a cherry-red

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