John Perry (engineer)

John PerryPerry, JohnProf. John Perry
John Perry (14 February 1850 – 4 August 1920) was a pioneering engineer and mathematician from Ireland.wikipedia
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Alice Perry

and one of James's daughters was Alice Perry, the first Irish woman with an engineering degree (and one of the first in the world).
Her uncle, John Perry, was a Fellow of the Royal Society and invented the navigational gyroscope.

William Thomson, 1st Baron Kelvin

Lord KelvinWilliam ThomsonWilliam Thomson, Lord Kelvin
Perry worked as Lord Kelvin's assistant at the University of Glasgow, and later became professor of mechanical engineering at Finsbury Technical College.
Although his former assistant John Perry published a paper in 1895 challenging Kelvin's assumption of low thermal conductivity inside the Earth, and thus showing a much greater age, this had little immediate impact.

John Milne

Milne, JohnJ. MilneMilne
He was a colleague of William Edward Ayrton and John Milne at the Imperial College of Engineering in Tokyo, 1875–79, and was also a Fellow of the Royal Society.
Milne was hired by the Meiji government of the Empire of Japan as a foreign advisor and professor of mining and geology at the Imperial College of Engineering in Tokyo from 8 March 1876, where he worked under Henry Dyer and with William Edward Ayrton and John Perry.

William Edward Ayrton

William E. AyrtonWilliam AyrtonAyrton, William Edward
He was a colleague of William Edward Ayrton and John Milne at the Imperial College of Engineering in Tokyo, 1875–79, and was also a Fellow of the Royal Society.
He published, both alone and jointly with others, a large number of papers on physical, and in particular electrical, subjects, and his name was especially associated, together with that of Professor John Perry, with the invention of a long series of electrical measuring instruments, including the spiral-spring ammeter, and the wattmeter.

Physical Society of London

Physical SocietyLondon Physical SocietyFPSL
In 1900 he was elected president of the Institution of Electrical Engineers, and from 1906–08 served as president of the Physical Society of London.

Continental drift

drifteddriftingcontinental drift theory
The failure of the scientific community to accept a fluid interior to the Earth held back ideas in geology until the concept was revived by proponents of continental drift, and even in the 1960s geophysical models were still being constructed on the basis that the Earth was solid.
In addition, Eduard Suess had proposed a supercontinent Gondwana in 1885 and the Tethys Ocean in 1893, assuming a land-bridge between the present continents submerged in the form of a geosyncline, and John Perry had written an 1895 paper proposing that the earth's interior was fluid, and disagreeing with Lord Kelvin on the age of the earth.

Garvagh

Garvagh Primary SchoolGarvagh, Northern IrelandMovenis & Killykergan
He was born on 14 February 1850 at Garvagh, County Londonderry, the second son of Samuel Perry and a Scottish-born wife.

County Londonderry

LondonderryCo. LondonderryDerry
He was born on 14 February 1850 at Garvagh, County Londonderry, the second son of Samuel Perry and a Scottish-born wife.

University of Glasgow

Glasgow UniversityGlasgowGlasgow College
Perry worked as Lord Kelvin's assistant at the University of Glasgow, and later became professor of mechanical engineering at Finsbury Technical College. Perry received an honorary doctorate (LL.D) from the University of Glasgow in June 1901.

Mechanical engineering

mechanical engineermechanicalmechanical engineers
Perry worked as Lord Kelvin's assistant at the University of Glasgow, and later became professor of mechanical engineering at Finsbury Technical College.

City and Guilds of London Institute

City and GuildsCity & GuildsCity and Guilds College
Perry worked as Lord Kelvin's assistant at the University of Glasgow, and later became professor of mechanical engineering at Finsbury Technical College.

Imperial College of Engineering

engineering institutionKōbushō KōgakuryōTokyo Imperial College of Engineering
He was a colleague of William Edward Ayrton and John Milne at the Imperial College of Engineering in Tokyo, 1875–79, and was also a Fellow of the Royal Society.

Fellow of the Royal Society

FRSForMemRSFellows of the Royal Society
He was a colleague of William Edward Ayrton and John Milne at the Imperial College of Engineering in Tokyo, 1875–79, and was also a Fellow of the Royal Society.

Institution of Electrical Engineers

IEEInstitute of Electrical EngineersFIEE
In 1900 he was elected president of the Institution of Electrical Engineers, and from 1906–08 served as president of the Physical Society of London.

Max Schuler

Maximilian Schuler
The book was later reprinted by Dover Publications in 1957 as Spinning Tops and Gyroscopic Motions. Although others (Max Schuler in Germany, Sperry in the USA) had been working on developing practical gyrocompasses, Perry collaborated with Sidney Brown to further develop these and they were awarded : "Gyro-compass" by John Perry, Sidney George Brown, filed August 1917; granted 1919.

Elmer Ambrose Sperry

Elmer SperryElmer A. SperrySperry
The book was later reprinted by Dover Publications in 1957 as Spinning Tops and Gyroscopic Motions. Although others (Max Schuler in Germany, Sperry in the USA) had been working on developing practical gyrocompasses, Perry collaborated with Sidney Brown to further develop these and they were awarded : "Gyro-compass" by John Perry, Sidney George Brown, filed August 1917; granted 1919.

Gyrocompass

gyro compassgyroscopic compassgyro compasses
The book was later reprinted by Dover Publications in 1957 as Spinning Tops and Gyroscopic Motions. Although others (Max Schuler in Germany, Sperry in the USA) had been working on developing practical gyrocompasses, Perry collaborated with Sidney Brown to further develop these and they were awarded : "Gyro-compass" by John Perry, Sidney George Brown, filed August 1917; granted 1919.

Sidney Brown

Sidney George Brown
The book was later reprinted by Dover Publications in 1957 as Spinning Tops and Gyroscopic Motions. Although others (Max Schuler in Germany, Sperry in the USA) had been working on developing practical gyrocompasses, Perry collaborated with Sidney Brown to further develop these and they were awarded : "Gyro-compass" by John Perry, Sidney George Brown, filed August 1917; granted 1919.

Legum Doctor

LL.D.LLDLL.D
Perry received an honorary doctorate (LL.D) from the University of Glasgow in June 1901.

Thermal conductivity

heat conductivitythermalconductivity
In 1895, Perry published a paper challenging Kelvin's assumption of low thermal conductivity inside the Earth, and thus disputing Kelvin's estimate that the Earth was only 20–400 million years old, but this had little impact.

Radioactive decay

radioactiveradioactivitydecay mode
It was not until the discovery in 1903 that radioactive decay releases heat and the development a few years later of radiometric dating of rocks that it was accepted that the age of the earth was many times older, as Perry had argued.

Radiometric dating

radiometrically dateddatedradiometric
It was not until the discovery in 1903 that radioactive decay releases heat and the development a few years later of radiometric dating of rocks that it was accepted that the age of the earth was many times older, as Perry had argued.

Luminiferous aether

aetherluminiferous etherether
Kelvin rejected this idea as there was no evidence of tidal deformation of the Earth's crust, and in response Perry made a reference to Kelvin's favourite demonstration of the slow deformation of shoemaker's wax to illustrate the supposed qualities of the presumed luminiferous aether thought then to be necessary to transmit light through space.

Scientific community

research communityscientific communitiesscience community
The failure of the scientific community to accept a fluid interior to the Earth held back ideas in geology until the concept was revived by proponents of continental drift, and even in the 1960s geophysical models were still being constructed on the basis that the Earth was solid.

Geophysics

geophysicistgeophysicalgeophysicists
The failure of the scientific community to accept a fluid interior to the Earth held back ideas in geology until the concept was revived by proponents of continental drift, and even in the 1960s geophysical models were still being constructed on the basis that the Earth was solid.