George Johnstone StoneyFRS, Irish physicist, dies on July 5, 1911, at Notting Hill, London, England. He is most famous for introducing the term “electron” as the “fundamental unit quantity of electricity.” He introduces the concept, though not the word, as early as 1874, initially naming it “electrine,” and the word itself comes in 1891. He publishes around 75 scientific papers during his lifetime.
Stoney is born on February 15, 1826, at Oakley Park, near Birr, County Offaly, in the Irish Midlands, the son of George Stoney and Anne (née Bindon Blood). His only brother is Bindon Blood Stoney, who becomes chief engineer of the Dublin Port and Docks Board. The Stoney family is an old-established Anglo-Irish family. During the time of the famine (1845–52), when land prices plummet, the family property is sold to support his widowed mother and family. He attends Trinity College Dublin (TCD), graduating with a BA degree in 1848. From 1848 to 1852 he works as an astronomy assistant to William Parsons, 3rd Earl of Rosse, at Birr Castle, County Offaly, where Parsons had built the world’s largest telescope, the 72-inch Leviathan of Parsonstown. Simultaneously he continues to study physics and mathematics and is awarded an MA by TCD in 1852.
From 1852 to 1857, Stoney is professor of physics at Queen’s College Galway. From 1857 to 1882, he is employed as Secretary of the Queen’s University of Ireland, an administrative job based in Dublin. In the early 1880s, he moves to the post of superintendent of Civil Service Examinations in Ireland, a post he holds until his retirement in 1893. He continues his independent scientific research throughout his decades of non-scientific employment duties in Dublin. He also serves for decades as honorary secretary and then vice-president of the Royal Dublin Society (RDS), a scientific society modeled after the Royal Society of London and, after his move to London in 1893, he serves on the council of that society as well. Additionally, he intermittently serves on scientific review committees of the British Association for the Advancement of Science from the early 1860s.
Stoney publishes seventy-five scientific papers in a variety of journals, but chiefly in the journals of the Royal Dublin Society. He makes significant contributions to cosmic physics and to the theory of gases. He estimates the number of molecules in a cubic millimeter of gas, at room temperature and pressure, from data obtained from the kinetic theory of gases. His most important scientific work is the conception and calculation of the magnitude of the “atom of electricity.” In 1891, he proposes the term “electron” to describe the fundamental unit of electrical charge, and his contributions to research in this area lays the foundations for the eventual discovery of the particle by J. J. Thomson in 1897.
Stoney proposes the first system of natural units in 1881. He realizes that a fixed amount of charge is transferred per chemical bond affected during electrolysis, the elementary chargee, which can serve as a unit of charge, and that combined with other known universal constants, namely the speed of lightc and the Newtonian constant of gravitationG, a complete system of units can be derived. He shows how to derive units of mass, length, time and electric charge as base units. Due to the form in which Coulomb’s law is expressed, the constant 4πε0 is implicitly included, ε0 being the vacuum permittivity.
Like Stoney, Max Planck independently derives a system of natural units (of similar scale) some decades after him, using different constants of nature.
Hermann Weyl makes a notable attempt to construct a unified theory by associating a gravitational unit of charge with the Stoney length. Weyl’s theory leads to significant mathematical innovations, but his theory is generally thought to lack physical significance.
Stoney marries his cousin, Margaret Sophia Stoney, by whom he has had two sons and three daughters. One of his sons, George Gerald Stoney FRS, is a scientist. His daughter Florence StoneyOBE is a radiologist while his daughter Edith is considered to be the first woman medical physicist. His most scientifically notable relative is his nephew, the Dublin-based physicist George Francis FitzGerald. He is second cousin of the grandfather of Ethel Sara Turing, mother of Alan Turing.
After moving to London, Stoney lives first at Hornsey Rise, north London, before moving to 30 Chepstow Crescent, Notting Hill, west London. In his later years illness confines him to a single floor of the house, which is filled with books, papers, and scientific instruments, often self-made. He dies at his home on July 5, 1911. His cremated ashes are buried in St. Nahi’s Church, Dundrum, Dublin.
Stoney is born into an old-established Anglo-Irish scientific family at 40 Wellington Road, Ballsbridge, Dublin, on January 6, 1869. The daughter of George Johnstone Stoney, FRS, an eminent physicist who coins the term “electron” in 1891 as the “fundamental unit quantity of electricity,” and his wife and cousin, Margaret Sophia Stoney. One of her two brothers, George Gerald, is an engineer and a Fellow of the Royal Society (FRS). One of her two sisters, Florence Stoney, is a radiologist and receives an OBE. Her cousin is the Dublin-based physicist George Francis FitzGerald FRS (1851–1901), and her uncle Bindon Blood Stoney FRS is Engineer of Dublin Port, renowned for building a number of the main Dublin bridges and developing the Quayside.
Stoney demonstrates considerable mathematical talent and gains a scholarship at Newnham College, Cambridge, where she achieves a First in the Part I Tripos examination in 1893. However, she is not awarded a University of Cambridge degree as women are excluded from graduation until 1948. During her time at Newnham, she is in charge of the College telescope. She is later awarded a BA and an MA from Trinity College Dublin, after they accept women in 1904.
Following the 1876 Medical Act, it is illegal for academic institutions to prevent access to medical education based on gender. The first medical school for women in Britain is established in 1874 by Dr. Sophia Jex-Blake in anticipation of this law. The London School of Medicine for Women quickly becomes part of the University of London, with clinical teaching at the Royal Free Hospital. Stoney’s sister Florence is a student at the school, graduates in medicine with honours in 1895 (MB BS) and obtains her MD in 1898. Meanwhile, Stoney gains an appointment as a physics lecturer at the school in 1899. Her first tasks are to set up a physics laboratory and design the physics course. The laboratory is planned for 20 students, and the course content is pure physics, as required by university regulations. It includes mechanics, magnetism, electricity, optics, sound, heat and energy. In her obituary in The Lancet, an ex-student of hers notes: “Her lectures on physics mostly developed into informal talks, during which Miss Stoney, usually in a blue pinafore, scratched on a blackboard with coloured chalks, turning anxiously at intervals to ask ‘Have you taken my point?’. She was perhaps too good a mathematician … to understand the difficulties of the average medical student, but experience had taught her how distressing these could be”.
In 1901, the Royal Free Hospital appoints Florence into a new part-time position of medical electrician. The following April, the two sisters open a new x-ray service in the electrical department. During their time at the Royal Free Hospital, the two sisters actively support the women’s suffrage movement, though oppose the direct violent action with which it is later associated.
During her time at the school, Stoney also plays a central role in the British Federation of University Women (BFUW). She is elected treasurer, in her absence, at the first executive meeting on October 9, 1909, a position she holds until the end of May 1915. She becomes increasingly engaged with the political lobbying of the Federation. At the executive meeting on October 19, 1912, she proposes the names of two members for a subcommittee to secure the passing into law of a bill to enable women to become barristers, solicitors or parliamentary agents. The legislation is eventually enacted after the war within the Sex Disqualification (Removal) Act 1919.
Stoney resigns her post at the school in March 1915 and it is recorded that “with due regret and most unwillingly a change is desirable in the physics lectureship.” She is offered £300 on tendering her resignation.
Both Stoney and Florence offer their services to the British Red Cross at the War Office in London, to provide a radiological service to support the troops in Europe, on the day Britain declares war. Their offer is refused, because they are women. Florence sets up her own unit with the Women’s Imperial Service League and spends the next 6 months in Europe. Stoney organises supplies from London where she also serves on the League’s committee. Florence returns to London at the time Stoney resigns from the London School of Medicine for Women. She contacts the Scottish Women’s Hospitals (SWH), an organisation formed in 1914 to give medical support in the field of battle and financed by the women’s suffrage movement. The organisation has gained agreement to set up a new 250-bed tented hospital at Domaine de Chanteloup, Sainte-Savine, near Troyes (France), funded by the Cambridge women’s colleges of Girton and Newnham and it becomes her role to plan and operate the x-ray facilities. She establishes stereoscopy to localise bullets and shrapnel and introduces the use of x-rays in the diagnosis of gas gangrene, interstitial gas being a mandate for immediate amputation to give any chance of survival.
The hospital is near the front line and, in her own words, by September 1915, “the town had been evacuated, the station had been mined, and we heard the heavy guns ever going at nighttime.” The unit is entirely female, except for two part-time male drivers, and her technical assistant, Mr. Mallett.
They are assigned to the Corps Expéditionnaire d’Orient and ordered to move to Serbia. After boarding the steamship Mossoul in Marseille, they reach Salonika (known as Thessaloniki in modern Greece) on November 3, where they take the night train north to Ghevgheli (now Gevgelija in modern North Macedonia), on the Serbian side of the Greek border. They set up a hospital in an unused silk factory where they treat 100 patients with injuries ranging from frostbite to severe lung and head wounds. Following defeats at the hands of Bulgarian forces, Stoney and her staff retreat to Salonika by December 6, 1916. Eleven days later, they have re-established the hospital on a drained low swamp by the sea, and by New Year’s Day 1917 she has the lights on and the x-rays working. Despite the lack of equipment and resources, she establishes an electrotherapy department and various equipments for the muscular rehabilitation of the soldiers in their care. She also assists with problems on two British hospital ships, on which the x-ray systems have been damaged during a storm and gives support to the SWH unit in Ostrovo (now Arnissa on Lake Vegoritida formerly lake Ostrovo in Northern Greece), which arrives during September 1916. She has a break for sick leave in December 1917 and returns the following summer. She applies for an appointment as an army camp radiologist in Salonika, but her demand is blocked by the War Office.
In October 1917, Stoney returns to France to lead the x-ray departments at the SWH hospitals of Royaumont and Villers-Cotterêts. In March 1918, she has to supervise a camp closure and retreat for the third time, when Villers-Cotterêts is overrun by the German troops. During the final months of the war the fighting intensifies and there is a steep increase in workload. In the month of June alone the x-ray workload peaks at over 1,300, partly because of an increased use of fluoroscopy.
On returning to England, Stoney takes a post as lecturer in physics in the Household and Social Science department at King’s College for Women which she holds until retirement in 1925. After leaving King’s she moves to Bournemouth, where she lives with her sister Florence, who is suffering from spinal cancer, dying in 1932.
During her retirement, Stoney resumes her work with the BFUW for which she had acted as the first treasurer before the war. She becomes one of the earliest (and oldest) members of the Women’s Engineering Society and plays an active part in the organisation until shortly before her death. She travels widely and, in 1934, she speaks to the Australian Federation of University Women on the subject of women in engineering, highlighting the contribution made by women workers during the war. In 1936, she establishes the Johnstone and Florence Stoney Studentship in the BFUW, for “research in biological, geological, meteorological or radiological science undertaken preferably in Australia, New Zealand or South Africa.” The studentship is now administered by Newnham College, Cambridge, and supports clinical medical students going abroad for their elective period. The declaration of Trust is dated February 11, 1942 and the Johnstone And Florence Stoney Studentship Fund Charity is registered on March 25, 1976.
Stoney dies on June 25, 1938, at age 69, and obituaries are printed in both the scientific and medical press – Nature, The Lancet, The Woman Engineer and national newspapers in England, The Times and Australia.
Stoney is remembered for her considerable bravery and resourcefulness in the face of extreme danger, and her imagination in contributing to clinical care under the most difficult conditions of war. As a strong advocate of education for women, she enables young graduate women to spend time on research overseas and another to enable physicists to enter medical school thanks to the fund she created. Through her work and engagements, she is remembered as a pioneer of medical physics.
(Pictured: Edith Anne Stoney during her time in Cambridge in the early 1890s)
Jellett marries his cousin on his mother’s side, Dorothea Charlotte Morris Morgan, daughter of James Morgan, on July 7, 1855. The marriage produces seven children. His son, William Morgan Jellett, is a member of the Parliament of the United Kingdom and is the father of the celebrated artist Mainie Jellett, and of Dorothea Jellett, director of the orchestra of the Gaiety Theatre, Dublin. Another son Henry Holmes Jellett is a civil engineer in British India. His daughter Harriette Mary Jellett is the wife of the noted Irish physicistGeorge Francis FitzGerald. Another daughter Eva Jellett is the first woman to graduate with a degree in medicine from Trinity and goes on to practice as a doctor in India.
Jellett graduates B.A. in mathematics in 1837, M.A. 1843, B.D. 1866, and D.D. 1881. He is ordained a priest in 1846. In 1848 he is elected to the chair of natural philosophy at TCD, and in 1868 he receives the appointment of commissioner of Irish national education.
In 1851 Jellett is awarded the Cunningham Medal of the Royal Irish Academy for his work on the “Calculus of Variations.” The society later elects him their president, a position he holds from 1869 to 1874.
In 1870, on the death of Dr. Thomas Luby, Jellett is co-opted a Senior Fellow, and thus a member of the Board of TCD. William Ewart Gladstone‘s government in February 1881 appoints him provost of Trinity. In the same year he is awarded a Royal Medal by the Royal Society.
After the disestablishment of the Church of Ireland by the Irish Church Act 1869, Jellett takes an active part in the deliberations of the general synod and in every work calculated to advance its interests. He is an able mathematician and writes A Treatise of the Calculus of Variations (1850), and A Treatise on the Theory of Friction (1872), as well as several papers on pure and applied mathematics, articles in the Transactions of the Royal Irish Academy. He also writes some theological essays, sermons, and religious treatises, of which the principals are An Examination of some of the Moral Difficulties of the Old Testament (1867), and The Efficacy of Prayer (1878).
Jellett dies of blood poisoning at the provost’s house, TCD, on February 19, 1888, and is buried in Mount Jerome Cemetery on February 23. The funeral procession is the largest that ever left Trinity.
(Pictured: “John Hewitt Jellett,” oil on canvas by Sarah Purser)
Professor of Moral Philosophy at Trinity College Dublin and vicar of St. Anne’s, Dawson Street, at the time of his son’s birth, William FitzGerald is consecrated Bishop of Cork, Cloyne and Ross in 1857 and translates to Killaloe and Clonfert in 1862. George returns to Dublin and enters TCD as a student at the age of sixteen, winning a scholarship in 1870 and graduating in 1871 in Mathematics and Experimental Science. He becomes a Fellow of Trinity in 1877 and spends the rest of his career there, serving as Erasmus Smith’s Professor of Natural and Experimental Philosophy from 1881 to 1901.
In 1883, following from Maxwell’s equations, FitzGerald is the first to suggest a device for producing rapidly oscillating electric currents to generate electromagnetic waves, a phenomenon which is first shown to exist experimentally by the German physicist Heinrich Hertz in 1888.
FitzGerald is better known for his conjecture in his short letter to the editor of Science. “The Ether and the Earth’s Atmosphere” explains that if all moving objects were foreshortened in the direction of their motion, it would account for the curious null-results of the Michelson–Morley experiment. He bases this idea in part on the way electromagnetic forces are known to be affected by motion. In particular, he uses some equations that had been derived a short time before by his friend the electrical engineer Oliver Heaviside. The Dutch physicist Hendrik Lorentz hits on a very similar idea in 1892 and develops it more fully into Lorentz transformations, in connection with his theory of electrons.
The Lorentz–FitzGerald contraction hypothesis becomes an essential part of the Special Theory of Relativity, as Albert Einstein publishes it in 1905. He demonstrates the kinematic nature of this effect, by deriving it from the principle of relativity and the constancy of the speed of light.
FitzGerald suffers from many digestive problems for much of his shortened life. He becomes very ill with stomach problems. He dies on February 22, 1901, at his home, 7 Ely Place in Dublin, the day after an operation on a perforated ulcer. He is buried in Mount Jerome Cemetery.
A crater on the far side of the Moon is named after FitzGerald, as is a building at Trinity College Dublin.
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