Abstract: A cassette for measuring the torque output of the tape drive of a cassette recorder and/or player has a housing with two hubs, to which the ends of a tape are connected. A slide is displaceable against the force of a spring and carries a tape-deflecting roller about which the tape is trained. The slide carries several pointers for movement with it. Several different exposed faces of the cassette housing have respective dials provided on or at them, and each pointer cooperates with one of these dials. Pull applied to the tape as a result of hub rotation by the tape drive of a machine being tested, causes the slide to be displaced from its rest position. The degree of this displacement is a function of the applied torque which can be read off all of the several dials. At least one of the dials will always be exposed for observation, irrespective of what particular type of cassette machine is being tested. Various modifications are also described herein.

Abstract: Method and apparatus for accelerating a large inertia load from rest to a predetermined speed of rotation by means of a synchronous dynamoelectric machine. A synchronous dynamoelectric machine, such as a turbine generator, which is mechanically coupled to a gas turbine prime mover, is started synchronously to bring the gas turbine up to a speed which exceeds its stall speed under load. The rotor field winding of the synchronous dynamoelectric machine is connected to receive direct current excitation from a rotatable rectifier assembly of a brushless exciter. During starting, a quadrature axis winding disposed around the stator of the brushless exciter is energized by single phase alternating current. Alternating current excitation is induced by transformer action within the rotor armature winding of the exciter and is applied to the rotor field winding after being rectified by the rotatable rectifier assembly.