Abstract: A cymbals stand comprising upper and lower cymbals pairs on the stand, each pair having primary and secondary discs adapted to be moved relatively toward one another to clash; an actuator rod projecting upwardly, and movable upwardly and downwardly; and structure including a pin or pins for attaching at least one of the cymbals of at least one pair to the rod, to be moved by the rod relative to the other pair of cymbals.
Abstract: A sonde is movable lengthwise in and relative to tubular structure such as a drill collar; slits extend through the tubular structure; and antennae coils on the sonde come into registration with the slits, for transmitting electromagnetic energy into the underground formation via certain slits, and for receiving such transmitted energy back through other of the slits, for processing.
Abstract: A foot-operated, bass drum pedal assembly is provided, and it includes: a base in the form of a metal plate, a first drum beater, a support for the beater mounted on the base, and a pedal pivotally mounted to the base and operatively connected to the beater to pivot same as the pedal is pivoted by the drummer's foot, and structure located proximate the pedal to sense downward movement of the pedal to predetermined downward position, and to produce an electrical signal usable to effect production of phenomena corresponding to a drum beat.