Sometimes he would endeavour to impart to his fellow-workmen the results of his scientific reading. Everything that he learnt from books was so new and so wonderful to him, that he regarded the facts he drew from them in the light of discoveries, as if they had been made but yesterday. Once he tried to explain to some of the pitmen how the earth was round, and kept turning round. But his auditors flatly declared the thing to be impossible, as it was clear that “at the bottom side they must fall off!” “Ah!” said George, “you don’t quite understand it yet.” His son Robert also early endeavoured to communicate to others the information which he had gathered at school; and Dr. Bruce has related that, when visiting Killingworth on one occasion, he found him engaged in teaching algebra to such of the pitmen’s boys as would become his pupils. [Picture: The Sundial] While Robert was still at school, his father proposed to him during the holidays that he should construct a sun-dial, to be placed over their cottage-door at West Moor. “I expostulated with him at first,” said Robert, “that I had not learnt sufficient astronomy and mathematics to enable me to make the necessary calculations. But he would have no denial. ‘The thing is to be done,’ said he; ‘so just set about it at once.’ Well; we got a ‘Ferguson’s Astronomy,’ and studied the subject together. Many a sore head I had while making the necessary calculations to adapt the dial to the latitude of Killingworth. But at length it was fairly drawn out on paper, and then my father got a stone, and we hewed, and carved, and polished it, until we made a very respectable dial of it; and there it is, you see,” pointing to it over the cottage-door, “still quietly numbering the hours when the sun is shining. I assure you, not a little was thought of that piece of work by the pitmen when it was put up, and began to tell its tale of time.” The date carved upon the dial is “August 11th, MDCCCXVI.” Both father and son were in after-life very proud of the joint production. Many years after, George took a party of savans, when attending the meeting of the British Association at Newcastle, over to Killingworth to see the pits, and he did not fail to direct their attention to the sun-dial; and Robert, on the last visit which he made to the place, a short time before his death, took a friend into the cottage, and pointed out to him the very desk, still there, at which he had sat while making his calculations of the latitude of Killingworth.