Abstract: A measuring apparatus for the uniformity and/or the dynamic-balance of a tire is disclosed. The apparatus comprises a supporting member which is rotated with supporting a tested tire, a holding member which holds said supporting member with allowing to vibrate during rotation thereof and a regulating system which prevents the vibration of the supporting member during rotation thereof. The vibration of the supporting member is prevented by the regulating system for a uniformity measurement while it is allowed during a dynamic-balance measurement.

Abstract: A measuring apparatus for the uniformity and the dynamic-balance of a tire is disclosed. The apparatus comprises a supporting member which is rotated with supporting a tested tire, a holding member which holds said supporting member with allowing to vibrate during rotation thereof and a regulating system which prevents the vibration of the supporting member during rotation thereof. The vibration of the supporting member is prevented by the regulating system for a uniformity measurement while it is allowed during a dynamic-balance measurement.

Abstract: A method for conducting a double flank meshing test uses test and a master gear with numbers of teeth having no common factors with respect to each other, and a test gear is used to calibrate the master gear.

Abstract: A pulse-operated mode switching mechanism for tape recorders comprises a single solenoid operated in response to a pulse of different periods depending on the function of the operating key. A rotary wheel is driven by a motor to provide a 360.degree. revolution in response to the energization of the solenoid. Electromagnetic transducer heads are mounted on a carrier plate which is movable between a first position in which the heads are remote from the tape and a second position in which the tape is in contact with the heads. The carrier plate is moved from the first to second position by the rotation of the rotary wheel when the solenoid is energized for an interval greater than a first predetermined interval and returned to the first position in response to the energization of the solenoid. During playback or recording mode the solenoid is energized for an interval greater than the first predetermined interval so that the transducer heads are brought into contact with the tape.

Abstract: A solenoid actuated control system comprises a solenoid device having a plunger carrying a transverse actuator pin and means for angularly moving the plunger to one of a plurality of predetermined angular positions in which the actuator pin is in operative alignment with a corresponding one of a plurality of instruments.