The boy's book of trades and the tools used in themAnonymous
General
The boy's book of trades and the tools used in them
Anonymous
Industrial arts -- Juvenile literature; Vocational guidance -- Juvenile literature
The die and swage are called _prints_ by the workpeople. Besides the
bolster, the part which fastens into the handle, technically termed
the _tang_, is also shaped from the piece of iron welded on to the
cutting part of the blade. After the bolster and tang have been properly
finished, the blade is heated again, and then well hammered on the anvil.
This operation, which is termed _smithing_, requires particular care and
attention. It is intended to consolidate the steel, and to render it
brighter. The next process the blade has to undergo is that of _marking_.
This is done with a broad punch made of the very best and hardest steel,
and having the name and corporate or trade mark of the firm carved on
the bottom end or point. The blade is heated to a dull red (worm-red,
as it is termed by the workmen), and the mark cut in on one side of
the blade with the punch by a single blow of the hammer. Now comes the
most important process of all, viz. the hardening and tempering of the
blades. Upon the effectual performance of these operations depends the
practical value of the articles. The Sheffield workmen have justly and
deservedly acquired the very highest reputation for peculiar skill in
this most difficult department of the cutlery business. The hardening of
the blade is effected by heating it to bright redness, then plunging it
perpendicularly into cold water, which operation renders it extremely
hard, but at the same time very brittle, which is an inconvenience,
of course, requiring to be remedied. This is done by the process of
tempering. To this end, the hardened blades are first rubbed with finely
powdered sand, to remove scales, &c. from the surface; they are then
placed on an oblong tray made of steel, and on this exposed to the fire
until they acquire a bright blue tint. The workman judges of the proper
degree of tempering entirely by the colour, and the utmost attention is
bestowed upon this point to ensure the most perfect unanimity in this
respect. The hardened and tempered blades are then submitted to the
manager’s inspection, who applies various tests to them, and rejects any
that may turn out imperfect in any one point.
Public-domain text, read in full here on John Shaqi.
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