294 KBPOET NATIONAIi ADVISORT COMMITTEE FOR AERONAUTICS motor-generator set with Ward Leonard control system, of speed one pole change was provided and the other For the full-scale wind tunnel it was found that alter- variations are obtained by the introduction of resistance nating current… … XlGUSE 3.—Schematic diawiug of tbe balance. approximately 30 percent less than the direct-current motors are connectedthrough an automatic switchboard equipment. Two 4,000-horsepower sUp-ring induction to one drum-type controller located in the test cham- motors with 24 steps of speed between 75…
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