After a late dinner, which occupied very short time and was always of a plain and frugal description,[64] he would proceed to dispose of his correspondence, or prepare sketches of drawings, and give instructions as to their completion. He would occasionally refresh himself for this evening work by a short doze, which, however, he would never admit had exceeded the limits of "winking," to use his own term. Mr. Frederick Swanwick, who officiated as his secretary after the appointment of Mr. Gooch as resident engineer to the Bolton and Leigh Railway, has informed us that he then remarked--what in after years he could better appreciate--the clear, terse, and vigorous style of Stephenson's dictation; there was nothing superfluous in it, but it was close, direct, and to the point--in short, thoroughly business-like. And if, in passing through the pen of the amanuensis, his meaning happened in any way to be distorted or modified, it did not fail to escape his detection, though he was always tolerant of any liberties taken with his own form of expression, so long as the words written down conveyed his real meaning. His strong natural acumen showed itself even in such matters as grammar and composition--a department of knowledge in which, it might be supposed, he could scarcely have had either time or opportunity to acquire much information. But here, as in all other things, his shrewd common sense came to his help, and his simple, vigorous English might almost be cited as a model of composition. His letters and reports written, and his sketches of drawings made and explained, the remainder of the evening was usually devoted to conversation with his wife and those of his pupils who lived under his roof, and constituted, as it were, part of the family. He then delighted to test the knowledge of his young companions, and to question them upon the principles of mechanics. If they were not quite "up to the mark" on any point, there was no escaping detection by evasive or specious explanations on their part. These always met with the verdict of, "Ah! you know naught about it now; but think it over again, and tell me the answer when you understand it." If there was even partial success in the reply, it would at once be acknowledged, and a full explanation was given, to which the master would add illustrative examples for the purpose of impressing the principle more deeply upon the pupil's mind.