Thomas Drummond

Captain Thomas Drummond (10 October 1797 – 15 April 1840), from Edinburgh was a Scottish British Army officer, civil engineer and senior public official. He used the Drummond light which was employed in the trigonometrical survey of Great Britain and Ireland. He is sometimes mistakenly given credit for the invention of limelight, at the expense of Sir Goldsworthy Gurney. It was Drummond, however, who realised its value in surveying.

Early life Drummond was the second of three sons. Despite his father dying when he was young, he credited his mother with getting him through his education at Edinburgh High School and then on to be a Royal Engineer cadet at Woolwich Academy in 1813. He showed an early gift for mathematics. After Woolwich he was stationed in Edinburgh and was involved with public works. He was bored with this and had enrolled at Lincoln's Inn when he was recruited to use his trigonometry to help conduct a survey in the Highlands. He reported that the light could be observed 68 miles away and would cast a strong shadow at a distance of thirteen miles.

Appointment as Under-Secretary for Ireland In 1835, he was appointed as Under-Secretary for Ireland, heading up the Dublin Castle administration, a position he held until his death in 1840. A supporter of the Whigs, Drummond was held in high regard by Irish, whom he treated with impartiality. Death Drummond died in 1840 and was buried in Mount Jerome Cemetery, Dublin. It was concluded by his family physician, Dr. Johnson, who spent his last days with Drummond, that he was afflicted with peritonitis, which was symptomatic of an undetermined medical cause. It is believed by some that overwork and stress precipitated his premature death in 1840 after working unceasingly for five years as Irish under-secretary.

His dying words were reported as:

His death took place on 15 April 1840, “in the plenitude of mental power and maturity of knowledge, beloved in private and esteemed in public.”

Drummond was critical of the system of large estates ("landlordism") in Ireland and famously stated, "Property has its duties as well as its rights."

He is credited with developing Drummond’s Light for use in surveying.