What are the findings of a federal judge's instructions on credibility of witnesses?

The instructions on the credibility of witnesses were in accordance with standards uniformly approved by us and, in our view, were especially appropriate in this case, including the instruction by which the credibility of a defendant who takes the stand is to be evaluated. See United States v. Mahler, 363 F.2d 673, 678 (2 Cir. 1966), and authorities cited.

In short, upon the entire record, we hold that the trial judge did "remain the judge, impartial, judicious, and, above all, responsible for a courtroom atmosphere in which guilt or innocence was soberly and fairly tested." United States v. Brandt, 196 F.2d 653, 655-56 (2 Cir. 1952).