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Sir Henry Bessemer (January 19, 1813 – March 15, 1898) was an Englishmarker engineer and inventor. Bessemer's name is chiefly known in connection with the Bessemer process for the manufacture of steel.

Early life

Henry Bessemer's father, Anthony, was born in London, but moved to Paris when he was 21 years old. He was an inventor who while he was engaged by the Paris Mint, made a machine for making medallions that could produce steel dies from a larger model. He became a member of the French Academy of Science, for his improvements to the optical microscope, when he was only 26. He was forced to leave Paris by the French Revolution of 1848, and returned to Britain. There he invented a process for making gold chains, which was successful, and enabled him to buy a small estate in the village of Charltonmarker, near Hitchinmarker in Hertfordshiremarker.

Bessemer process

Bessemer converter
Bessemer worked on the problem of manufacturing cheap steel for the purposes of ordinance production from 1850 to 1855 when he patented his method. On August 24, 1856 Bessemer first described the process to a meeting of the British Association in Cheltenham which he titled "The Manufacture of Iron Without Fuel." It was published in full in The Times. The Bessemer process involved using oxygen in air blown through molten pig iron to burn off the impurities and thus create steel.

Many industries were constrained by the lack of steel, being reliant on cast iron and wrought iron alone. Examples include railway structures such as bridges and tracks, where the treacherous nature of cast iron was keenly felt by many engineers and designers. There had been many accidents when cast iron beams collapsed suddenly, such as the Dee bridge disastermarker of May 1847 and later failures such as the Wooton bridge collapsemarker and the Bull bridge accidentmarker of 1860. The problem recurred at the Tay Bridge disastermarker of 1879, and failures continued until all cast iron under-bridges were replaced by steel structures. Wrought iron structures were much more reliable with very few failures.

Though this process is no longer commercially used, at the time of its invention it was of enormous industrial importance because it lowered the cost of production steel, leading to steel being widely substituted for cast iron. Bessemer's attention was drawn to the problem of steel manufacture in the course of an attempt to improve the construction of guns.

Implementation

Bessemer licensed the patent for his process to five Ironmasters, but from the outset, the companies had great difficulty producing good quality steel. Mr Göransson, a Swedish ironmaster, using the purer charcoal pig iron of that country, was the first to make good steel by the process, but only after many attempts. His results prompted Bessemer to try a purer iron obtained from Cumberlandmarker hematite, but even with this he had only limited success until Robert Forester Mushet, who had carried out thousands of experiments at Darkhill, in the Forest of Deanmarker, showed that adding an exact amount of carbon and manganese, in the form of spiegeleisen, improved the quality of the finished product, increasing its malleability.

When Bessemer tried to induce makers to take up his improved system, he met with general rebuffs and was eventually driven to undertake the exploitation of the process himself. He erected steelworks in Sheffieldmarker, on ground purchased with the help of friends, and began to manufacture steel. At first the output was insignificant, but gradually the magnitude of the operations was enlarged until the competition became effective, and steel traders generally became aware that the firm of Henry Bessemer & Co. was underselling them to the extent of $20 a ton. This argument to the pocket quickly had its effect, and licences were applied for in such numbers that, in royalties for the use of his process, Bessemer received a sum in all considerably exceeding a million pound sterling.

Patent battles

Bessemer converter, Kelham Island Museum, Sheffield, England (2002)
Of course, patents of such obvious value did not escape criticism, and invalidity was freely urged against them on various grounds. But Bessemer was fortunate enough to maintain them intact without litigation, though he found it advisable to buy up the rights of one patentee, while in the case of Robert Forester Mushet, was freed from anxiety by the patent being allowed to lapse in 1859 through non-payment of fees.

Mushet's procedure was not absolutely essential and Bessemer proved this in 1865 by exhibiting a series of steel samples made using his process alone, but the value of Mushet's procedure was shown by its near universal adoption in conjunction with the Bessemer Process. Whether or not Mushet's patents could have been sustained is not known, but in 1866 Robert Mushet's 16 year old daughter travelled to London alone to confront Henry Bessemer at his offices, arguing that Bessemer's success was based on the results of her father’s work. Bessemer decided to pay Mushet an annual pension of £300, a very considerable sum, which he paid for 25 years; and it is possible that this was done with a view to keeping the Mushets from legal action.

In 1866, Bessemer also provided finance for Zerah Colburn, the American locomotive engineer and journalist, to start a new weekly engineering newspaper called Engineering, and based in Bedford Street, London. It was not until many years later that the name of Colburn's benefactor was revealed. Prior to the launch of Engineering, Colburn, through the pages of The Engineer, had given support to Bessemer's work on steel and steelmaking.

Other inventions

Bessemer was a prolific inventor and held at least 129 patents, spanning from 1838 to 1883. They were chiefly concerned with manufacturing in five areas; iron, steel, glass, sugar, and cannons or other ordnance.

His autobiography describes all of his inventions, some in great detail, as one might expect from such an innovative man. It is also a very readable book which relates many amusing incidents in his long and fruitful career.

Among Bessemer's numerous other inventions were movable dies for embossed stamp, and a screw extruder for more efficiently extracting sugar from sugar cane.

After suffering from seasickness in 1868, he designed the SS Bessemer (also called the "Bessemer Saloon"), a passenger steamship with a cabin on gimbals designed to stay level, however rough the sea, to save her passengers from seasickness. The mechanism - hydraulics controlled by a steersman watching a spirit level - worked in model form and in a trial version built in his garden in Denmark Hill, London. However it never received a proper seagoing test as, when the ship demolished part of the Calais pier on her maiden voyage, investor confidence was lost and the ship was scrapped..

Bessemer also obtained a patent in 1857 for the casting of metal between contrarotating rollers - a forerunner of today's continuous casting processes and remarkably, Bessemer's original idea has been implemented in the direct continuous casting of steel strip.



Later years and death

Bessemer died in March 1898 in Denmark Hillmarker, Londonmarker. He is buried in West Norwood cemeterymarker,London SE27, where he has good company with influential Victorians such as Sir Henry Tate, Sir Henry Doulton and Baron de Reuters also being buried within the same cemetery.

Honours and legacy

Henry Bessemer was Knighted on June 26, 1879, and in the same year was made a fellow of the Royal Society.Sheffield's Kelham Island Industrial Heritage Museum, maintains an early example of a Bessemer Converter for public viewing. He has also had a Street named after him in the town Hitchinmarker (Bessemer Close) bordering the village of Icklefordmarker in 1995, and has a road named Bessemer Way in Rotherham in his honour. In 2009, the public house "The Fountain" in Sheffield City Centre was renamed "The Bessemer", in homage to Henry Bessemer who had a huge impact on the Steel City's development.

See also



References

Bibliography



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