 19th century physicist , John Tyndall , discovered the Tyndall effect . Father Nicholas Joseph Callan , Professor of Natural Philosophy in Maynooth College , is best known for his invention of the induction coil , transformer and he discovered an early method of galvanisation in the 19th century . 
 19th century physicist , John Tyndall , discovered the Tyndall effect . Father Nicholas Joseph Callan , Professor of Natural Philosophy in Maynooth College , is best known for his invention of the induction coil , transformer and he discovered an early method of galvanisation in the 19th century . 
19th century physicist , John Tyndall , discovered the Tyndall effect . Father Nicholas Joseph Callan , Professor of Natural Philosophy in Maynooth College , is best known fa his invention of da induction coil , transformer and he discovered an early method of galvanisation in the 19th century .