NICHOLAS CALLAN – PRIEST SCIENTIST AT MAYNOOTH
Nicholas Joseph Callan was Professor of Natural Philosophy (now called Physics) at St. Patrick’s College, Maynooth, from 1826 until his death in 1864. He was a pioneering scientist in the field of electrical science. Unfortunately his inventions were subsequently attributed to other scientists and his great work is only now starting to get recognition.
Callan was born in 1799 at Darver, Co. Louth, into a well-to-do family of farmers. After early education at Dundalk Academy he entered the National Seminary at Maynooth in 1816. During his third year there he studied physics under Dr. Cornelius Denvir and developed a special interest in electricity and magnetism.
Callan was ordained a priest in 1823 and went to Rome to study at Sapienza University, obtaining a doctorate in divinity in 1826. While in Rome he became acquainted with the work of the pioneers in electricity, Luigi Galvani (1737-1798) and Alessandro Volta (1745-1827). When Dr. Denvir resigned Callan was appointed to the chair at Maynooth in 1826.
Callan began to work intensively on electricity, helped by funding from family and friends. His main claim to fame is the invention of the induction coil, a device for producing high voltage currents and the forerunner of the step-up transformer, an essential device in the modern world of limitless electrical supply.
In 1831 Michael Faraday discovered electromagnetic induction which basically means that a changing magnetic field can induce an electrical current to flow in a strip of wire. Also in 1825, William Sturgeon invented the electromagnet. In this device, wire is wrapped around a soft iron core. Electrical current is passed through the wire, which strongly magnetises the iron core.
Callan’s batteries produced very high voltages when connected to his experimental coils of wire. Those coils could give large electrical shocks and Callan used this as another way of testing battery power. He persuaded his students to take shocks from the coils and he gauged the power of the battery from their reactions. One student named William Walsh, who later became Archbishop of Dublin, was rendered unconscious by a shock. The College authorities asked Callan to be more careful with his students, so he switched over to electrocuting turkeys.
In 1838 Callan stumbled on the principle of the self-exciting dynamo. He found that by moving an electromagnet in Earth’s magnetic field he could produce electricity without a battery. Callan also discovered an early form of galvanisation to protect iron from rusting when he was experimenting on battery design, and he patented the idea.
Callan also constructed electric motors and in 1837 he built a small motor to drive a trolley around his lab. He proposed using battery powered locomotives on the new railways and, with great foresight, predicted electric light.
The Third Earl of Rosse, who built the giant telescope at Birr, was a member of the Board of Visitors to Maynooth College. Callan visited Birr to view the telescope, but, for some reason, he was not admitted. When later the Third Earl came to Maynooth to see the induction coil, Callan suggested that the lord should return to Birr and view the coil through his telescope.
Callan’s invention of the induction coil was attributed to the German instrument-maker Heinrich Ruhmkorff (1803-1877). Callan was largely forgotton by the wider world of science mainly because Maynooth was a theological university and science had a low status on the curriculum. Callan’s pioneering work was easily forgotten after his death in such a setting.
In 1936 Professor P.J. McLaughlin published his researches into Callan’s publications and proved that Callan invented the induction coil. This was officially acknowledged by the world of physics in 1953.
Callan died of natural causes at Maynooth in 1864. Today the College Museum at NUI Maynooth holds a remarkable collection of old scientific instruments, including many items from Callan’s laboratory.
(This article first appeared in The Irish Times, February 21, 2002.)