Year: Day to Day Men: January 17
A Sunny Day
The seventeenth of January in the year 1761 marks the birth date of Sir James Hall of Dunglass, 4th Baronet, who was a Scottish geologist and geophysicist. He was the first to use an analogue modeling synthesizer to investigate the formation of folds in the earth’s layers. Hall’s discoveries in this field were published in 1815.
Born at Dunglass Castle in East Lothian, James Hall was the only son and heir of Sir John Hall, 3rd Baronet who had served on the Grand Jury for the 1748 Edinburgh trial of those involved in the 1745 Jacobite uprising. James Hall studied at Christ’s College, Cambridge, and the University of Edinburgh during the 1780s. At Edinburgh, he studied under Professor of Medicine and Chemistry Joseph Black and Regius Professor of Natural History John Walker, one of the main scientific consultants of his day.
From attending Walker’s courses, Hall learned how to use the chemical compositions of minerals to determine the relative age of the earth’s layers. Walker also emphasized in his classes the importance of chemistry to the study of geology. After his studies, Hall travelled Europe to seek book dealers who dealt in works on mineralogy, geology and chemistry. His travels to France brought him into contact with nobleman and chemist Antoine-Laurant de Lavoisier who wrote the first extensive list of elements. Lavoisier was also instrumental in the development of the metric system as well as the reformation of chemical nomenclature through a set of rules for the generation of systematic names.
Upon his return to his home in Scotland, Sir James Hall continued his studies in the fields of chemistry and geology. During the 1780s and 1790s, he was interested in geologist James Hutton’s ‘Theory of the Earth” which suggested that the strata of the planet was continually being worn or melted down, thus making the planet a giant system of circulating material. Hall traveled with Hutton and professor John Playfair in the spring of 1788 on a boat trip to Siccar Point on Scotland’s Berwickshire coast. At Siccar Point, they discovered a rock formation that became known as Hutton’s Unconformity. This geological phenomenon marked the location where rock formations, created at different times and by different forces, joined together. Other locations in Scotland were later identified by Hutton.
Initially skeptical of the chemical viability of Hutton’s theory, Hall soon published several papers on the chemical composition of the strata. He experimented on granite to prove that it was possible for molten rock to form a continuous sequence of deposits, typically in parallel layers. By melting basalt in an iron furnace, Hall demonstrated its return to the original form when cooled; his melted limestone proved that, melted under pressure, limestone did not decompose. These findings were published by Hall in the Royal Society of Edinburgh’s scientific journal “Transactions”.
Sir John Hall traveled throughout Europe to examine the geological formations of Mount Etna and the Alps mountain range, both areas formed from the collision of the planet’s tectonic plates. He also studied the similarity of lava flows in Italy to geological sites in Scotland. Hall, in addition to his works in the field of science, was also the author of various works on architecture among which was his 1797 “Essay on the Origins and Principles of Gothic Architecture”. Sir John Hall, 4th Baronet, died at home in the central area of Edinburgh survived by a wife and six children. He is buried in Greyfriars Kirkyard in central Edinburgh.