第 28 节
作者:
铲除不公 更新:2021-03-08 19:38 字数:9321
the 〃wise man〃 of his neighbourhood; and was not only consulted as to
the repairs of machinery; but also of the human frame。 He practised
surgery with dexterity; though after an empirical fashion; and was
held in especial esteem as an oculist。 His success was such that his
advice was sought in many surgical diseases; and he was always ready
to give it; but declined receiving any payment in return。
In the exercise of his mechanical calling; he introduced several
improved tools; but was much hindered by the inferior quality of the
metal supplied to him; which was common German steel。 He also
experienced considerable difficulty in finding a material suitable
for the springs and pendulums of his clocks。 These circumstances
induced him to turn his attention to the making of a better kind of
steel than was then procurable; for the purposes of his trade。 His
first experiments were conducted at Doncaster;*
'footnote。。。
There are several clocks still in existence in the neighbourhood of
Doncaster made by Benjamin Huntsman; and there is one in the
possession of his grandson; with a pendulum made of cast…steel。 The
manufacture of a pendulum of such a material at that early date is
certainly curious; its still perfect spring and elasticity showing
the scrupulous care with which it had been made。
。。。'
but as fuel was difficult to be had at that place; he determined; for
greater convenience; to remove to the neighbourhood of Sheffield;
which he did in 1740。 He first settled at Handsworth; a few miles to
the south of that town; and there pursued his investigations in
secret。 Unfortunately; no records have been preserved of the methods
which he adopted in overcoming the difficulties he had necessarily to
encounter。 That they must have been great is certain; for the process
of manufacturing cast…steel of a first…rate quality even at this day
is of a most elaborate and delicate character; requiring to be
carefully watched in its various stages。 He had not only to discover
the fuel and flux suitable for his purpose; but to build such a
furnace and make such a crucible as should sustain a heat more
intense than any then known in metallurgy。 Ingot…moulds had not yet
been cast; nor were there hoops and wedges made that would hold them
together; nor; in short; were any of those materials at his disposal
which are now so familiar at every melting…furnace。
Huntsman's experiments extended over many years before the desired
result was achieved。 Long after his death; the memorials of the
numerous failures through which he toilsomely worked his way to
success; were brought to light in the shape of many hundredweights of
steel; found buried in the earth in different places about his
manufactory。 From the number of these wrecks of early experiments; it
is clear that he had worked continuously upon his grand idea of
purifying the raw steel then in use; by melting it with fluxes at an
intense heat in closed earthen crucibles。 The buried masses were
found in various stages of failure; arising from imperfect melting;
breaking of crucibles; and bad fluxes; and had been hid away as so
much spoiled steel of which nothing could be made。 At last his
perseverance was rewarded; and his invention perfected; and though a
hundred years have passed since Huntsman's discovery; the description
of fuel (coke) which he first applied for the purpose of melting the
steel; and the crucibles and furnaces which he used; are for the most
part similar to those in use at the present day。 Although the making
of cast…steel is conducted with greater economy and dexterity; owing
to increased experience; it is questionable whether any maker has
since been able to surpass the quality of Huntsman's manufacture。
The process of making cast…steel; as invented by Benjamin Huntsman;
may be thus summarily described。 The melting is conducted in clay
pots or crucibles manufactured for the purpose; capable of holding
about 34 lbs。 each。 Ten or twelve of such crucibles are placed in a
melting…furnace similar to that used by brass founders; and when the
furnace and pots are at a white heat; to which they are raised by a
coke fire; they are charged with bar steel reduced to a certain
degree of hardness; and broken into pieces of about a pound each。
When the pots are all thus charged with steel; lids are placed over
them; the furnace is filled with coke; and the cover put down。 Under
the intense heat to which the metal is exposed; it undergoes an
apparent ebullition。 When the furnace requires feeding; the workmen
take the opportunity of lifting the lid of each crucible and judging
how far the process has advanced。 After about three hours' exposure
to the heat; the metal is ready for 〃teeming。〃 The completion of the
melting process is known by the subsidence of all ebullition; and by
the clear surface of the melted metal; which is of a dazzling
brilliancy like the sun when looked at with the naked eye on a clear
day。 The pots are then lifted out of their place; and the liquid
steel is poured into ingots of the shape and size required。 The pots
are replaced; filled again; and the process is repeated; the red…hot
pots thus serving for three successive charges; after which they are
rejected as useless。
When Huntsman had perfected his invention; it would naturally occur
to him that the new metal might be employed for other purposes
besides clock…springs and pendulums。 The business of clock…making was
then of a very limited character; and it could scarcely have been
worth his while to pursue so extensive and costly a series of
experiments merely to supply the requirements of that trade。 It is
more probable that at an early stage of his investigations he
shrewdly foresaw the extensive uses to which cast…steel might be
applied in the manufacture of tools and cutlery of a superior kind;
and we accordingly find him early endeavouring to persuade the
manufacturers of Sheffield to employ it in the manufacture of knives
and razors。 But the cutlers obstinately refused to work a material so
much harder than that which they had been accustomed to use; and for
a time he gave up all hopes of creating a demand in that quarter。
Foiled in his endeavours to sell his steel at home; Huntsman turned
his attention to foreign markets; and he soon found he could readily
sell abroad all that he could make。 The merit of employing cast…steel
for general purposes belongs to the French; always so quick to
appreciate the advantages of any new discovery; and for a time the
whole of the cast…steel that Huntsman could manufacture was exported
to France。 When he had fairly established his business with that
country; the Sheffield cutlers became alarmed at the reputation which
cast…steel was acquiring abroad; and when they heard of the
preference displayed by English as well as French consumers for the
cutlery manufactured of that metal; they readily apprehended the
serious consequences that must necessarily result to their own trade
if cast…steel came into general use。 They then appointed a deputation
to wait upon Sir George Savile; one of the members for the county of
York; and requested him to use his influence with the government to
obtain an order to prohibit the exportation of cast…steel。 But on
learning from the deputation that the Sheffield manufacturers
themselves would not make use of the new steel; he positively
declined to comply with their request。 It was indeed fortunate for
the interests of the town that the object of the deputation was
defeated; for at that time Mr。 Huntsman had very pressing and
favourable offers from some spirited manufacturers in Birmingham to
remove his furnaces to that place; and it is extremely probable that
had the business of cast…steel making become established there; one
of the most important and lucrative branches of its trade would have
been lost to the town of Sheffield。
The Sheffield makers were therefore under the necessity of using the
cast…steel; if they would retain their trade in cutlery against
France; and Huntsman's home trade rapidly increased。 And then began
the efforts of the Sheffield men to wrest his secret from him。 For
Huntsman had not taken out any patent for his invention; his only
protection being in preserving his process as much a mystery as
possible。 All the workmen employed by him were pledged to inviolable
secrecy; strangers were carefully excluded from the works; and the
whole of the steel made was melted during the night。 There were many
speculations abroad as to Huntsman's process。 It was generally
believed that his secret consisted in the flux which he employed to
make the metal melt more readily; and it leaked out amongst the
workmen that he used broken bottles for the purpose。 Some of the
manufacturers; who by prying and bribing got an inkling of the
process; followed Huntsman implicitly in this respect; and they would