In 1928, McCrea studies Albrecht Unsöld‘s hypothesis and discovers that three quarters of the sun is made of hydrogen and about one quarter is helium with 1% being other elements. Previous to this many people thought the sun consisted mostly of iron. After this, people realise most stars consist of hydrogen.
In 1932 McCrea moves to Imperial College London as a Reader and marries Marian Core the following year. In 1936 he becomes Professor of Mathematics and head of the mathematics department at the Queen’s University Belfast.
During World War II McCrea is co-opted onto the Admiralty Operational Research Group. After the war, he joins the mathematics department at Royal Holloway College in 1944. He is elected a Fellow of the Royal Society of London in 1952.
In 1964 McCrea proposes mass transfer mechanism as an explanation of blue straggler stars. In 1965, he creates the astronomy centre of the physics department at the University of Sussex.
John Howard Kyan, inventor of the ‘kyanising’ process for preserving wood, is born on November 27, 1774, in Dublin. His father, also John Howard Kyan, is the owner of valuable copper mines in County Wicklow. He is educated to take part in the management of the mines, but soon after he enters the company its fortunes decline, and in 1804 his father dies almost penniless.
For a time, Kyan is employed at some vinegar works at Newcastle upon Tyne, but subsequently removes to London. The decay of the timber supports in his father’s copper mines had already directed his attention to the question of preserving wood, and as early as 1812 he begins experiments with a view to discovering a method of preventing the decay. Eventually he finds that bichloride of mercury or corrosive sublimate, as it is commonly called, gives the best results and, without revealing the nature of the process, he submits a block of oak impregnated with the substance to the Admiralty in 1828. It is placed in the ‘fungus pit’ at Woolwich, where it remains for three years exposed to all the conditions favourable to decay. When taken out in 1831, it is found to be perfectly sound, and after further trials it still remains unaffected.
Kyan patents his discovery in 1832 (Nos. 8263 and 6309), extending the application of the invention to the preservation of paper, canvas, cloth, cordage, etc. A further patent is granted in 1836 (No. 7001).
The process attracts great attention. Michael Faraday chooses it as the subject of his inaugural lecture at the Royal Institution on February 22, 1833, on his appointment as Fullerian professor of chemistry. Dr. George Birkbeck gives a lecture upon it at the Royal Society of Arts on December 9, 1834, and in 1835 the Admiralty publishes the report of a committee appointed by the board to inquire into the value of the new method.
In 1836, Kyan sells his rights to the Anti-Dry Rot Company, an Act of Parliament being passed which authorises the raising of a capital of £250,000. Tanks are constructed at Grosvenor Basin, Pimlico, at the Grand Surrey Canal Dock, Rotherhide, and at the City Road Basin.
Among the early applications of the process is the kyanising of the palings around the Inner Circle, Regent’s Park, which is carried out in 1835 as an advertisement with small brass plates being attached to the palings at intervals stating that the wood has been submitted to the new process. The plates soon disappear, but the original palings still remain in good condition.
It becomes evident that iron fastenings cannot be used in wood treated with corrosive sublimate, on account of the corrosive action, and it is said that the wood becomes brittle. The salt is somewhat expensive and Sir William Burnett‘s method of preserving timber by zinc chloride, and afterwards the application of creosote for that purpose, proves severe competitors. Doubts begin to be expressed as to the real efficiency of kyanising, and the process gradually ceases to be employed.
John Kyan dies on January 5, 1850, in New York City, where he is engaged on a plan for filtering the water supplied to that city by the Croton Aqueduct.
Walton is the son of a Methodist minister, Rev John Walton (1874–1936), and Anna Sinton (1874–1906). In those days a general clergyman’s family moves once every three years, and this practice carries him and his family, while he is a small child, to Rathkeale, County Limerick, where his mother dies, and to County Monaghan. He attends day schools in counties Down and Tyrone, and at Wesley College in Dublin before becoming a boarder at Methodist College Belfast in 1915, where he excels in science and mathematics. He obtains degrees in mathematics and experimental science from Trinity College Dublin in 1926.
Walton goes to Trinity College, Cambridge in 1927 where he works with Cockcroft in the Cavendish Laboratory under Ernest Rutherford until 1934. In 1928 he attempts two methods of high-energy particle acceleration. Both fail, mainly because the available power sources could not generate the necessary energies, but his methods are later developed and used in the betatron and the linear particle accelerator. In 1929 Cockcroft and Walton devise an accelerator that generates large numbers of particles at lower energies. With this device in 1932 they disintegrate lithium nuclei with protons, the first artificial nuclear reaction not utilizing radioactive substances and so becomes the first person in history to split the atom.
Although he retires from Trinity College Dublin in 1974, he retains his association with the Physics Department at Trinity up to his final illness. His is a familiar face in the tea-room. Shortly before his death he marks his lifelong devotion to Trinity by presenting his Nobel medal and citation to the college. Ernest Walton dies at the age of 91 in Belfast on June 25, 1995. He is buried in Deans Grange Cemetery in Dublin.
(Pictured: Ernest T.S. Walton, 1951, by Nobel foundation)
Dixon is the youngest of the seven sons of George Dixon, a soap manufacturer, and Rebecca (née Yeates) Dixon. He is educated at Rathmines School and Trinity College, Dublin. In 1894, after studying in Bonn, Germany, he is appointed assistant and later full Professor of Botany at Trinity. In 1906 he becomes Director of the Botanic Gardens and in 1910 of the Herbarium also. He has a close working relationship with physicist John Joly and together they develop the cohesion theory of the ascent of sap.
Dixon’s early research includes work on the cytology of chromosomes and first mitosis in certain plants. Familiarity with work on transpiration and on the tensile strength of columns of sulfuric acid and water leads Dixon and Joly to experiment on transpiration. “On the Ascent of Sap” (1894) presents the hypothesis that the sap or water in the vessels of a woody plant ascends by virtue of its power of resisting tensile stress and its capacity to remain cohesive under the stress of great differences of pressure. Dixon and Joly further demonstrate that water is transported through passive vessels and not living cells.
Dixon writes Transpiration and the Ascent of Sap in Plants (1914), which brings various theories and experimental works together in a coherent argument. He also writes a textbook, Practical Plant Biology (1922).
In 1907 Dixon marries Dorothea Mary, daughter of Sir John H. Franks, with whom he raises three sons. He is the father of biochemistHal Dixon and grandfather of Adrian Dixon and Joly Dixon.
As a child Sloane possesses a strong curiosity of nature, and he develops a particular interest in plants. After studying medicine in London, he travels in France, taking an M.D. degree at the University of Orange in 1683. In 1685 he returns to London and is elected a fellow of the Royal Society. He proceeds to practice medicine as an assistant to British physician Thomas Sydenham. He is made a fellow of the Royal College of Physicians in 1687. That same year he accepts an opportunity to visit Jamaica, traveling as personal physician to the Christopher Monck, 2nd Duke of Albermarle, who had been appointed to govern the island.
The journey to Jamaica provides Sloane with the chance to pursue his interest in the natural sciences. During the 15 months of his travels, he visits multiple islands in the West Indies, including Saint Kitts, Nevis, and Barbados. He ultimately collects specimens of about 800 plants. He also records information on and collects specimens of various fish, mollusks, and insects, and he observes the local peoples and contemplates the natural phenomena of the area. His observations and the specimens he collects during the voyage lay the foundation for his later contributions to botany and zoology and for his role in the formation of the British Museum. He returns to England in 1689, his trip having been cut short by Monck’s death. His collection of plants from the West Indies is one of the first from that region to reach England.
Sloane’s trip to Jamaica also leads to his invention of a milk chocolate beverage. While on the island, he encounters a local drink made from a cacao plant. The beverage apparently makes him nauseous. To avoid this, he decides to mix the cacao material with milk. He finds this concoction to be not only more tolerable but also tasty and healthy. Shortly after his return to England, his milk-based concoction is sold by apothecaries as a medicinal product. His recipe later forms the basis for a milk chocolate product manufactured by Cadbury.
In 1696 Sloane publishes in Latin an elaborate catalogue, Catalogus Plantarum Quae in Insula Jamaica, on the plants he collected in Jamaica. He later publishes Natural History of Jamaica (2 Vol., 1707 and 1725), a comprehensive account of his studies of the natural phenomena of the island country.
Sloane also makes important contributions to medicine. He is physician to Queen Anne, King George I, and King George II. He is created a baronet in 1716, becoming the first medical practitioner to receive a hereditary title. He is relatively progressive as a physician, and, while serving George I, he adopts the practice of inoculation against smallpox for members of the royal family. In 1719 he is elected president of the Royal College of Physicians, a post he serves until 1735. In 1727 he becomes president of the Royal Society, succeeding physicist and mathematician Sir Isaac Newton. He holds the position until 1741. He earns a reputation as a specialist in eye diseases, and he eventually publishes Account of a Medicine for Soreness, Weakness and Other Distempers of the Eyes (1745).
Sloane is also known as an avid collector, and he benefits greatly from the acquisition of the cabinets of other collectors, including amateur scientist William Charleton and English apothecary and botanist James Petiver. When he retires from active work in 1741, his library and cabinet of curiosities has grown to be of unique value, and on his death, he bequeaths his collection to the nation, on condition that parliament pay his executors £20,000. The bequest is accepted and goes to form the collection opened to the public as the British Museum in 1759.
Sloane has no son that survives beyond infancy, and the baronetcy becomes extinct upon his death in London on January 11, 1753.
Kane is born at 48 Henry Street, Dublin on September 24, 1809 to John and Eleanor Kean (née Troy). His father is involved in the Irish Rebellion of 1798 and flees for a time to France where he studies chemistry. Back in Dublin, Kean (now Kane) founds the Kane Company and manufactures sulfuric acid.
Kane studies chemistry at his father’s factory and attends lectures at the Royal Dublin Society as a teenager. He publishes his first paper in 1828, Observations on the existence of chlorine in the native peroxide of manganese, in the London Quarterly Journal of Science, Literature and Art. The following year, his description of the natural arsenide of manganese results in the compound being named Kaneite in his honour. He studies medicine at Trinity College, Dublin, graduating in 1834 while working in the Meath Hospital. He is appointed Professor of Chemistry at the Apothecaries’ Hall, Dublin in 1831, which earns him the moniker of the “boy professor.” In the following year he participates in the founding of the Dublin Journal of Medical & Chemical Science.
Kane publishes a three-volume Elements of Chemistry in 1841–1844, and a detailed report on the Industrial Resources of Ireland. This includes the first assessment of the water power potential of the River Shannon, which is not realised until the 1920s at Ardnacrusha.
Kane becomes a political adviser on scientific and industrial matters. He serves on several commissions to enquire into the Great Irish Famine, along with Professors Lindley and Taylor, all more or less ineffective. His political and administrative work means that his contribution to chemistry ceases after about 1844.
Kane’s work on Irish industry leads to his being appointed director of the Museum of Irish Industry in Dublin in 1845. The Museum is a successor to the Museum of Economic Geology, and is housed at 51 St. Stephen’s Green.
Also in 1845 Kane becomes the first President of Queen’s College, Cork (now University College Cork). He does not spend a lot of time in Cork as he has work in Dublin, and his wife lives there. The science building on the campus is named in his honour. He is knighted in 1846.
In 1873 Kane takes up the post of National Commissioner for Education. He is elected president of the Royal Irish Academy in 1877, holding the role until 1882. In 1880 he is appointed the first chancellor of the newly created Royal University of Ireland. After a motion to admit women to the University, put forward by Prof. Samuel Haughton at Academic Council in Trinity College Dublin, March 10, 1880, Kane is appointed to a committee of ten men to look into the matter. He is opposed to the admission of women, and nothing is reported from the committee in the Council minutes for the next ten years.
Knowles’ early interest in botany is encouraged by her father, William James Knowles, himself an amateur scientist who takes Matilda and her sister to meetings of the Belfast Naturalists’ Field Club. This is where she first meets Robert Lloyd Praeger who continues to be a lifelong influence. In 1895 she is introduced to the Derry botanist Mary Leebody and together they work on a supplement to Samuel Alexander Stewart‘s and Thomas Hughes Corey‘s 1888 book the Flora of the North-east of Ireland.
Knowles then volunteers to help with the crowdsourcing of material about the plants of County Tyrone. While completing this work Knowles publishes her own first paper about Tyrone’s flowering plants in 1897. She eventually sends in over 500 examples that are considered for inclusion in the Irish Topographical Botany, which Praeger publishes in 1901.
In 1902, after attending the Royal College of Science for Ireland for a year, Knowles is appointed a temporary assistant in the then Botanical Section of the National Science and Art Museum. She works closely with Professor Thomas Johnson to continue the development of the Herbarium collection. She also co-authors with him the Hand List of Irish Flowering Plants and Ferns (1910).
One of Knowles’ first works is The Maritime and Marine Lichens of Howth, which the Royal Dublin Society publishes in 1913. Knowles had gathered the knowledge and experience to do this while diligently assisting with a survey of Clare Island as suggested by Praeger. This novel survey involves not only Irish but also several European scientists including prominent UK lichenologist, Annie Lorrain Smith. This is claimed as the most extensive piece of field work at the time. As a result, Knowles is able to create a foundation for her later specialism in lichens.
Knowles publishes more than thirty scientific papers on a wide range of botanical subjects between 1897 and 1933. It is while studying the lichens of Howth that she discovers how lichens by the shore grow in distinct tidal zones that can be distinguished by their colour: black, orange and grey.
Her major work is The Lichens of Ireland which adds over 100 species of lichen to the Irish List and records the distribution of the eight hundred species identified in Ireland. She achieves this task with the collaboration of thirty other natural scientists. It is published in 1929 and includes twenty lichens that had previously not been identified as Irish.
Professor Thomas Johnson retires in 1923, allowing Knowles to take over curatorship, working with Margaret Buchanan. As she becomes older Knowles’ hearing begins to fail such that she has to rely on an ear trumpet. Despite her deafness she still attends meetings. She cares for and adds to the National Museum Herbarium collection although never gets the credit she deserves. In 1933 she plans to retire but pneumonia ends her life before she ends her career. Knowles dies in Dublin on April 27, 1933.
Knowles is honoured with a commemorative plaque by the Irish National Committee for Science and Engineering in October 2014 to mark the 150th anniversary of her birth.
Brennan moves to Melbourne, Australia in 1861 with his parents. He starts his career as a watchmaker and a few years later is articled to Alexander Kennedy Smith, a renowned civil and mechanical engineer of the period. He serves as a sergeant in the Victorian Engineers under the command of Captain John James Clark. He invents the idea of a steerable torpedo in 1874, from observing that if a thread is pulled on a reel at an angle with suitable leverage, the reel will move away from the thread side. He spends some years working out his invention and receives a grant of £700 from the Victorian government towards his expenses. He patents the Brennan torpedo in 1877. The idea is trialed at Camden Fort near Crosshaven, County Cork.
Brennan goes to England in 1880 and brings his invention before the War Office. Sir Andrew Clarke alerts the authorities to the possibilities of the torpedo if used in the defence of harbours and channels, and the patent is eventually bought for a sum believed to be more than £100,000 (£ 9,331,100 in 2019). In 1887 he is appointed superintendent of the Brennan torpedo factory and is consulting engineer from 1896 to 1907.
Brennan does much work on a gyro monorail locomotive which is kept upright by a gyrostat. In 1903 he patents a gyroscopically balanced monorail system that he designs for military use. He successfully demonstrates the system on November 10, 1909, at Gillingham, England, but fears that the gyroscopes might fail prevents adoption of the system for widespread use.
From 1916 to 1919 Brennan serves in the munition invention department. From 1919 to 1926 he is engaged by the air ministry in aircraft research work at the Royal Aircraft Establishment, Farnborough, and gives much time to the invention of a helicopter. The government spends a large sum of money on it, but in 1926 the air ministry gives up working on it, much to Brennan’s disappointment.
Brennan marries Anna Quinn on 10 September 10, 1892. The marriage results in a son and a daughter. He is created a Companion of the Order of the Bath in 1892 and is foundation member of the National Academy of Ireland in 1922.
In January 1932 Brennan is knocked down by a car at Montreux, Switzerland, and dies on January 17, 1932. He is buried at St. Mary’s Catholic Cemetery, Kensal Green, London, in an unmarked plot numbered 2454 that is opposite the Chapel record office. On March 11, 2014, TaoiseachEnda Kenny unveils a new gravestone for Brennan at St. Mary’s in a ceremony honouring the inventor’s life and career.
Gillingham Library retains the archive of his papers.
Boyle is born on January 25, 1627, at Lismore Castle, in County Waterford. At age eight, he begins his formal education at Eton College, where his studious nature quickly becomes apparent. In 1639 he and his brother Francis embark on a grand tour of the continent together with their tutor Isaac Marcombes. In 1642, owing to the Irish rebellion, Francis returns home while Robert remains with his tutor in Geneva and pursues further studies.
Boyle returns to England in 1644, where he takes up residence at his hereditary estate of Stalbridge in Dorset. There he begins a literary career writing ethical and devotional tracts, some of which employ stylistic and rhetorical models drawn from French popular literature, especially romance writings. In 1649 he begins investigating nature via scientific experimentation. From 1647 until the mid-1650s, he remains in close contact with a group of natural philosophers and social reformers gathered around the intelligencer Samuel Hartlib. This group, the Hartlib Circle, includes several chemists who heighten his interest in experimental chemistry.
Boyle spends much of 1652–1654 in Ireland overseeing his hereditary lands and performing some anatomic dissections. In 1654 he is invited to Oxford, and he takes up residence at the university until 1668. In Oxford he is exposed to the latest developments in natural philosophy and becomes associated with a group of notable natural philosophers and physicians, including John Wilkins, Christopher Wren, and John Locke. These individuals, together with a few others, form the “Experimental Philosophy Club.” Much of Boyle’s best known work dates from this period.
In 1659 Boyle and Robert Hooke, the clever inventor and subsequent curator of experiments for the Royal Society, complete the construction of their famous air pump and use it to study pneumatics. Their resultant discoveries regarding air pressure and the vacuum appear in Boyle’s first scientific publication, New Experiments Physico-Mechanicall, Touching the Spring of the Air and Its Effects (1660). Boyle and Hooke discover several physical characteristics of air, including its role in combustion, respiration, and the transmission of sound. One of their findings, published in 1662, later becomes known as “Boyle’s law.” This law expresses the inverse relationship that exists between the pressure and volume of a gas, and it is determined by measuring the volume occupied by a constant quantity of air when compressed by differing weights of mercury.
Among Boyle’s most influential writings are The Sceptical Chymist (1661), which assails the then-current Aristotelian and especially Paracelsian notions about the composition of matter and methods of chemical analysis, and the Origine of Formes and Qualities (1666), which uses chemical phenomena to support the corpuscularian hypothesis. He argues so strongly for the need of applying the principles and methods of chemistry to the study of the natural world and to medicine that he later gains the appellation of the “father of chemistry.”
Boyle is a devout and pious Anglican who keenly champions his faith. He sponsors educational and missionary activities and writes a number of theological treatises. He is deeply concerned about the widespread perception that irreligion and atheism are on the rise, and he strives to demonstrate ways in which science and religion are mutually supportive. For Boyle, studying nature as a product of God’s handiwork is an inherently religious duty. He argues that this method of study would, in return, illuminate God’s omnipresence and goodness, thereby enhancing a scientist’s understanding of the divine. The Christian Virtuoso (1690) summarizes these views and may be seen as a manifesto of his own life as the model of a Christian scientist.
In 1668 Boyle leaves Oxford and takes up residence with his sister Katherine Jones, Vicountess Ranelagh, in her house on Pall Mall in London. There he sets up an active laboratory, employs assistants, receives visitors, and publishes at least one book nearly every year. Living in London also provides him the opportunity to participate actively in the Royal Society.
Boyle is a genial man who achieves both national and international renown during his lifetime. He is offered the presidency of the Royal Society and the episcopacy but declines both. Throughout his adult life, he is sickly, suffering from weak eyes and hands, recurring illnesses, and one or more strokes. He dies at age 64 on December 31, 1691, after a short illness exacerbated by his grief over Katherine’s death a week earlier. He leaves his papers to the Royal Society and a bequest for establishing a series of lectures in defense of Christianity. These lectures, now known as the Boyle Lectures, continue to this day.
Andrews begins a successful medical practice in his native Belfast in 1835, also giving instruction in chemistry at the Royal Belfast Academical Institution. In 1842, he marries Jane Hardie Walker. They have six children, including the geologist, Mary Andrews.
Andrews first becomes known as a scientific investigator with his work on the heat developed in chemical actions, for which the Royal Society awards him a Royal Medal in 1844. Another important investigation, undertaken in collaboration with Peter Guthrie Tait, is devoted to ozone. In 1845 he is appointed vice-president and professor of chemistry of the newly established Queen’s University Belfast. He holds these two offices until his retirement in 1879 at the age of 66.
His reputation mainly rests on his work with liquefaction of gases. In the 1860s he carries out a very complete inquiry into the gas laws — expressing the relations of pressure, temperature, and volume in carbon dioxide. In particular, he establishes the concepts of critical temperature and critical pressure, showing that a substance passes from vapor to liquid state without any breach of continuity.
In Andrews’ experiments on phase transitions, he shows that carbon dioxide may be carried from any of the states we usually call liquid to any of those we usually call gas, without losing homogeneity. The mathematical physicist Josiah Willard Gibbs cites these results in support of the Gibbs free energy equation. They also set off a race among researchers to liquify various other gases. In 1877-78 Louis Paul Cailletet is the first to liquefy oxygen and nitrogen.
Thomas Andrews dies in Belfast on November 26, 1885, and is buried in the city’s Borough Cemetery.
seamus dubhghaill 