At Cambridge and afterwards Owen had done important research work in electronics . But he is best remembered as an exceptionally lucid and attractive lecturer , carefully preparing his lectures and demonstrations in such a way as to make difficult matters in physics clear even to the weakest of his students, and showing great skill in gauging their capacities and great patience in overcoming their difficulties. This clarity of exposition caused him to be in great demand also as a public lecturer beyond the confines of his college; these lectures were usually delivered in Welsh , and in them he showed that the language, in skilled hands, could be made a fully adequate medium for instruction in science. His written Welsh , again, was excellent, and he wrote much on scientific matters for the Welsh periodicals. He published in book form Athroniaeth Pethau Cyffredin ( 1907 ), Cwrr y Llen ( 1914 ), Rhyfeddodau'r Cread ( 1933 ), and Y Mawr a'r Bach ( 1936 ).