Judge Nelson first became widely known in 1837, when he was appointed chief justice of the Supreme Court of the State of New York. The court was then composed of three judges, whose principal duty it was to hear and decide questions of law. It was a judicial body of great dignity and learning, with a fame so illustrious that its decisions had long been cited as authority in Westminster Hall, and in all the States of the Union where the common law prevailed.
In the Supreme Court of the United States, when he was promoted to that tribunal, and in the United States Circuit Courts, Judge Nelson was called upon to administer branches of law with which he was not in practice familiar, and some fears were expressed that these untried duties might cause him embarrassment. It was suggested that his long and severely critical administration of the common law, through its pleadings and practice, might have so educated him that he would fail in appreciating the more liberal and expansive systems of Equity, Maritime, Admiralty, and international jurisprudence administered in the national courts; and it was also thought improbable that a judge who had been early in professional life elevated to the bench of a common law court, would be able to explore and understand the complicated mechanical, chemical, and other scientific questions, which in Patent causes were constantly arising for exclusive adjudication in the federal courts.
But these apprehensions were all disappointed. Judge Nelson had no sooner taken his seat on the bench of the Circuit Court in New York City,[115] than he perceived that the cases on the calendar, though few in number, were so complicated, and embraced so many intricate questions, that they must be mastered according to a method that his former experience did not furnish. He investigated every new question as it arose. He listened earnestly to the arguments of counsel, and ever seemed resolved, before they concluded, to understand the points on which the case must finally turn. Often he descended from the bench when complicated machinery, or specimens illustrative of science, or models of vessels intended to develop the relations of colliding ships, were before him, and by their close and repeated study strove to understand the real points in controversy.