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bursting strength

Joseph Whitworth

Sir Joseph Whitworth, Baronet (December 21, 1803January 22, 1887) was an English engineer and entrepreneur.

Biography

Early life

Whitworth was born in Stockport, the son of Charles Whitworth, a teacher (some sources say that he was a Congregational minister), and at a young age developed an interest in machinery.

Career

After leaving school Whitworth became an indentured apprentice to an uncle who was a cotton spinner in Derbyshire. This was for a four year term after which he worked for another four years as a mechanic in a factory in Manchester. He then moved to London where he found employment working for Henry Maudslay, the inventor of the screw-cutting lathe, alongside such people has James Nasmyth (inventor of the steam hammer) and Richard Roberts.

Whitworth developed great skill as a mechanic while working for Maudslay, developing various precision machine tools and also introducing a box casting scheme for the iron frames of machine tools that simultaneously increased their rigidity and reduced their weight.

Whitworth also worked for Holtzapffel & Co (makers of ornamental lathes) and Joseph Clement. While at Clement's workshop he helped with the manufacture of Charles Babbage's calculating machine, the Difference engine. He returned to Openshaw, Manchester, in 1833 to start his own business manufacturing lathes and other machine tools, which became renowned for their high standard of workmanship. In 1850, architect Edward Walters was commissioned to build The Firs for Whitworth. This was a grand mansion at Fallowfield Manchester, which still stands today, functioning as Chancellors Hotel & Conference Centre.

Inventions

Whitworth popularized a method of producing accurate flat surfaces during the 1830s, using engineer's blue and scraping techniques on three trial surfaces. Up until his introduction of the scraping technique, the same three plate method was employed using polishing techniques, giving less accurate results. This led to an explosion of development of precision instruments using these flat surface generation techniques as a basis for further construction of precise shapes.

His next innovation, in 1840, was a measuring technique called "end measurements" that used a precision flat plane and measuring screw, both of his own invention. The system, with a precision of one millionth of an inch, was demonstrated at the Great Exhibition of 1851.

In 1841 Whitworth devised a standard for screw threads with a fixed thread angle of 55° and having a standard pitch for a given diameter. This soon became the first nationally standardized system; its adoption by the railway companies, who until then had all used different screw threads, leading to its widespread acceptance. It later became a British Standard, "British Standard Whitworth", abbreviated to BSW and governed by BS 84:1956.

Whitworth rifle

Whitworth was commissioned by the War Department of the British government to design a replacement for the calibre .577-inch Pattern 1853 Enfield, whose shortcomings had been revealed during the recent Crimean War. The Whitworth rifle had a smaller bore of 0.451 inch (11 mm) which was hexagonal, fired an elongated hexagonal bullet and had a faster rate of twist rifling [one turn in twenty inches] than the Enfield, and its performance during tests in 1859 was superior to the Enfield's in every way. The test was reported in The Times on April 23 as a great success. However, the new bore design was found to be prone to fouling and it was four times as expensive to manufacture than the Enfield, so it was rejected by the British government, only to be adopted by the French Army. An unspecified number of Whitworth rifles found their way to the Confederate states in the American Civil War, where they were called "Whitworth Sharpshooters".

The Enfield rifle was converted to Snider-Enfield Rifle by Jacob Snider, a Dutch-American wine merchant from Philadelphia. By converting existing Enfield rifles this way, the cost of a "new" breech-loading Snider-Enfield rifle was only 12 shillings.

Queen Victoria opened the first meeting of the British Rifle Association at Wimbledon, in 1860 by firing a Whitworth rifle from a fixed mechanical rest. The rifle scored a bull's eye at a range of 400 yards (366 m).

Breech-loading artillery

Whitworth also designed a large Rifled Breech Loading gun with a 2.75 inch (70 mm) bore, a 12 pound 11 ounce (5.75 kg) projectile and a range of about six miles (10 km). The spirally-grooved projectile was patented in 1855. This was also rejected by the British army, who preferred the guns from Armstrong, but was also used in the American Civil War.

While trying to increase the bursting strength of his gun barrels, Whitworth patented a process called "fluid-compressed steel" for casting steel under pressure, and built a new steel works near Manchester. Some of his castings were shown at the Great Exhibition in Paris ca. 1883.

Awards

Whitworth received many awards for the excellence of his designs, and was financially very successful. In 1850, then a Fellow of the Royal Society and President of the Institution of Mechanical Engineers, he built a house called The Firs in Fallowfield, south of Manchester. In 1854 he bought Stancliffe Hall in Darley Dale, Derbyshire. In 1872 he moved there with his second wife.

A strong believer in the value of technical education, Whitworth backed the new Mechanics' Institute in Manchester, which was to become UMIST, and helped found the Manchester School of Design. In 1868, he founded a scholarship for the advancement of mechanical engineering. In recognition of his achievements and contributions to education in Manchester, the Whitworth Building of the University of Manchester's Main Campus is named in his honour, as well as the University Halls of residence "Whitworth Park" and one of the main streets in Manchester's city centre, "Whitworth Street".

Death

Whitworth died in Monte Carlo, where he had travelled in the hope of improving his health. He was buried at the church of Darley (or Darley Dale) St Helen in Derbyshire. A detailed obituary was published in the American magazine The Manufacturer and Builder (Volume 19, Issue 6, June 1887). He directed his trustees to spend his fortune on philanthropic projects, which they still do to this day.

Books

  • Guns and Steel (1873) published in London by Longmans, Green, Reader & Dyer.

References

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