seamus dubhghaill

Promoting Irish Culture and History from Little Rock, Arkansas, USA

Tag Archives: Royal Dublin Society


by Leave a comment

Birth of Physicist John Joly

John Joly, Irish physicist famous for his development of radiation therapy in the treatment of cancer, is born in Bracknagh, County Offaly, on November 1, 1857. He is also known for developing techniques to accurately estimate the age of a geological period, based on radioactive elements present in minerals.

Joly is a second cousin of Charles Jasper Joly, the astronomer. He enters Trinity College, Dublin in 1876, graduating in Engineering in 1882 in first place with various special certificates in branches of engineering, at the same time obtaining a First-Class Honours in modern literature. He works as a demonstrator in Trinity’s Engineering and Physics departments before succeeding William Johnson Sollas in the Chair of Geology and Mineralogy in 1897, a position which he holds until his death in 1933.

Joly joins the Royal Dublin Society in 1881 while still a student and is a frequent contributor of papers. During his career he writes over 270 books and scientific papers.

On May 17, 1899, Joly reads his paper “An Estimate of the Geological Age of the Earth” to the Royal Dublin Society. In it, he proposes to calculate the age of the earth from the accumulation of sodium in the waters of the oceans. He calculates the rate at which the oceans should have accumulated sodium from erosion processes and determines that the oceans are about 80 to 100 million years old. The paper is quickly published, appearing four months later in the Society’s Scientific Transactions. Although this method is later considered inaccurate and is consequently superseded, it radically modifies the results of other methods in use at the time.

In 1903 he publishes an article in Nature in which he discusses the possibility of using radium to date the Earth and goes on to study the radioactive content of the Earth’s crust to formulate a theory of thermal cycles and examines the radioactive constituents of certain rocks as a means of calculating their age. Working in collaboration with Sir Ernest Rutherford, he uses radioactive decay in minerals to estimate, in 1913, that the beginning of the Devonian period could not be less than 400 million years ago, an estimate which is in line with modern calculations.

Joly serves as President of Section C (Geology) when the British Association for the Advancement of Science meets in Dublin in 1908, during which he presents his paper “Uranium and Geology” in an address to the society. This work describes radioactive materials in rocks and their part in the generation of the Earth’s internal heat.

Along with his friend Henry Horatio Dixon, Joly also puts forward the cohesion-tension theory which is now thought to be the main mechanism for the upward movement of water in plants.

In 1914 Joly develops a method of extracting radium and applies it in the treatment of cancer. As a Governor of Dr. Steevens’ Hospital in Dublin, in collaboration with Walter Stevenson, he devises radiation therapy methods and promotes the establishment by the Royal Dublin Society of the Irish Radium Institute where they pioneer the “Dublin method” of using a hollow needle for deep radiation therapy, a technique that later enters worldwide use. The Radium Institute also supplies capillary tubes containing radon to hospitals for some years for use in the treatment of tumours.

Joly is elected a Fellow of the Royal Society of London in 1892, is awarded the Boyle Medal of the Royal Dublin Society in 1911, the Royal Medal of the Royal Society of London in 1910, and the Murchison Medal of the Geological Society of London in 1923. He is also conferred honorary degrees by the National University of Ireland, the University of Cambridge, and the University of Michigan. After his death in 1933, his friends subscribe the sum of £1,700 to set up a memorial fund which is still used to promote the annual Joly Memorial Lectures at the University of Dublin, which were inaugurated by Sir Ernest Rutherford in 1935. He is also remembered by the Joly Geological Society, a student geological association established in 1960.

In 1973 a crater on Mars is named in Joly’s honour.


by Leave a comment

Birth of Richard John Griffith, Author of Griffith’s Valuation

richard-john-griffith

Richard John Griffith, Irish geologist, mining engineer, and chairman of the Board of Works of Ireland, is born in Hume Street, Dublin, on September 20, 1784. He completed the first complete geological map of Ireland and is author of the valuation of Ireland, known ever since as Griffith’s Valuation.

Griffith goes to school in Portarlington and later, while attending school in Rathangan, his school is attacked by the rebels during the Irish Rebellion of 1798. He also studies in Edinburgh, Scotland.

In 1799 he obtains a commission in the Royal Irish Artillery, but a year later, when the corps is incorporated with that of England, he retires, and devotes his attention to civil engineering and mining. He studies chemistry, mineralogy, and mining for two years in London under William Nicholson and afterwards examines the mining districts in various parts of England, Wales, and Scotland.

While in Cornwall he discovers ores of nickel and cobalt in material that has been rejected as worthless. He completes his studies under Robert Jameson and others at Edinburgh, is elected a Fellow of the Royal Society of Edinburgh in 1807, a member of the newly established Geological Society of London in 1808, and in the same year he returns to Ireland.

In 1809, he is appointed by the commissioners to inquire into the nature and extent of the bogs in Ireland and the means of improving them. In 1812 he is elected Professor of Geology and Mining Engineer to the Royal Dublin Society. Shortly afterwards he expresses his intention of preparing a geological map of Ireland. During subsequent years he makes many surveys and issues many reports on mineral districts in Ireland. These form the foundation of his first geological map of the country in 1815. He also succeeds Dr. Richard Kirwan as government inspector of mines in Ireland. In 1822 Griffith becomes engineer of public works in Cork, Kerry, and Limerick, and is occupied until 1830 in repairing old roads and in laying out many miles of new roads in some of the most inaccessible parts of the country.

Meanwhile, in 1825, he is appointed by the government to carry out a boundary survey of Ireland. He is to mark the boundaries of every county, barony, civil parish, and townland in preparation for the first Ordnance Survey. He is also called upon to assist in the preparation of a parliamentary Bill to provide for the general valuation of Ireland, which passes in 1826. Griffith is appointed Commissioner of Valuation in 1827 but does not start work until 1830 when the new 6″ maps become available from the Ordnance survey and which he is required to use as provided for by statute. He continues to work on this until 1868. On Griffith’s valuation the various local and public assessments are made.

His extensive investigations furnish him with ample material for improving his geological map and the second edition is published in 1835. A third edition on a larger scale (1 in. to 4 m.) is issued under the Board of Ordnance in 1839 and it is further revised in 1855. For this great work and his other services to science Griffith is awarded the Wollaston Medal by the Geological Society in 1854. In 1850 he is made chairman of the Irish Board of Works and in 1858 he is created a baronet.

Griffith dies at the age of 95 at his residence in Dublin on September 22, 1878. At the time of his death, he is the oldest surviving fellow of the Geological Society of London and is the last survivor of the long-since disbanded Royal Irish Regiment of Artillery. He is buried alongside his wife, Maria Jane, in Mount Jerome Cemetery, Harold’s Cross, Dublin.