Background
He was born in South Shields in 1843. His father, Marshall Tweddell, was a shipowner.
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Ralph Tweddell
Edit ProfileEducation
He was educated at Cheltenham College, with the intention of entering the army. However, more interested in engineering, he was apprenticed to R and West Hawthorn, a locomotive manufacturer in Newcastle upon Tyne.
Career
During his apprenticeship he took out a patent in 1865 for a portable hydraulic apparatus for fixing the ends of boiler tubes in tube plates. The encouraging results suggested that hydraulic power should be used for machines used in boiler construction. In 1865 he designed a stationary hydraulic riveting machine.
This was more effective than the existing mechanical riveting machines, which usually did not make steam-tight joints in the boilers of steamships, which were by then operating under higher pressure than before.
The plant, consisting of a pump, an accumulator, and a riveter, was first used by Thompson, Boyd & Company, of Newcastle. In 1871 he invented a portable riveter, so that the work did not have to be brought to the machine.
lieutenant was manufactured by Fielding & Platt. An early user was Armstrong, Mitchell and Company in Newcastle.
In 1873 it was used in riveting a lattice girder bridge carrying Primrose Street over the Great Eastern railway at Bishopsgate railway station in London.
The success of this led to its use in the construction of other bridges. was first used for locomotive work by F. West. Webb at Crewe Works. lieutenant was also used for agricultural machinery, for underframes of railway carriages, and by the Italian government for gun-carriages. In France, Tweddell"s system was used when in 1874 the French government began to build iron warships in Toulon, and it was later used at the shipyard at Penhoët near Saint-Nazaire, and at Brest.
In 1885 he was awarded a gold medal, under the Howard Trust, at the International Inventions Exhibition in South Kensington for "his system of applying hydraulic power to the working of machine tools, and for the rivetting and other machines which he has invented in connection with that system".
He sent three papers to the Institution of Mechanical Engineers including "On the Application of Water Pressure to Shop-tools and Mechanical Engineering Works". In 1890 a paper entitled "The Application of Water Pressure to Machine Tools and Appliances" was awarded a Bessemer Premium by the Society of Engineers.
In his spare time he was interested in hunting, shooting and fishing. He died in 1895 at his home near Gravesend in Kent, two years after a riding accident which affected his health.
Achievements
Membership
He became a member of the Institution of Mechanical Engineers in 1867. From 1879 he was a member of the Institution of Civil Engineers. He was also a member of the Société des ingénieurs civils de France from 1879.
