THE PROBLEM OF STARTING AN INDUCTION WIND TUNNEL WITH RETURN CIRCUIT IS DISCUSSED. THE BASIC EQUATIONS GOVERNING START-UP ARE GIVEN, AND THE PRINCIPAL EXPERIMENTS CONDUCTED WITH THE T PRIME SUB 2 WIND TUNNEL WITH PERIPHERAL INJECTION ARE SHOWN. FINALLY THE RESULTS OF EXPERIMENTS ABD OF THE COMPUTATION ARE DISCUSSED AND A COMPARISON OF EXPERIMENT AND COMPUTATION IS MADE.