Return top having conical apertures for producing sound

Claim 1

A WHISTLING RETURN TOP INCLUDING A PAIR OF SUBSTANTIALLY INDENTICAL HALF SECTIONS, EACH HALF SECTION BEING DEFINED BY A WALL HAVING AN OUTER CONVEX SURFACE AND AN INNER PLATE-LIKE PORTION JOINED TO THE PERIPHERY OF SAID WALL, EACH HALF SECTION INCLUDING A CHAMBER EXTENDING AROUND THE AXIS OF EACH HALF SECTION AND BETWEEN THE PLATE-LIKE PORTION AND SAID WALL, AT LEAST ONE HALF SECTION INCLUDING AT LEAST TWO APERTURES DIRECTED THROUGH THE OUTER SURFACE, EACH APERTURE BEING DIRECTED ALONG AN AXIS IN INTERSECTING RELATION TO THE AXIS OF EACH SECTION WHILE BEING INCLINED THERTO, EACH OF SAID APERTURES HAVING A GENERALLY RIGHT CONICAL FORM WITH THE CONICAL AXIS THEREOF GENERALLY COINCIDENT WITH ITS AXIS OF DIRECTION, THE SMALLER DIAMETER OF THE APERTURE BEING AT THE OUTER SURFACE OF SAID WALL TO THEREBY PROVIDE A RELATIVELY SHARP EDGE AROUND EACH APERTURE AT THE OUTER SURFACE, SAID APERTURES BEING SPACED FROM EACH OTHER AND LOCATED NEAR THE PERIPHERAL RIM OF SAID HALF SECTION, WHEREBY UPON SPINNING OF THE TWO HALF SECTIONS, AIR MAY PASS INTO AND OUT OF SAID CHAMBER THROUGH SAID APERTURES FOR A NOISE-PRODUCING EFFECT.