Abstract: A mixing bowl with protuberances one the outer surface of the side wall of the bowl. A first mixing bowl has a diameter greater than a second mixing bowl. The two bowls form a mixing bowl assembly wherein the protuberances of the inner bowl contact and abut the inner surface of the outer bowl to define a clearance gap between the two bowls, wherein if the bowls cool at different rates after being washed, the mixing bowls are not jammed together. Each protuberance extends outwardly about one-fourth inch and the gap defined between the bowls has a clearance dimension of about one-fourth inch. The inner bowl has three or four protuberances and the outer bowl has four protuberances. The mixing bowls are made of stainless steel.

Abstract: A decorative cover for smoke detectors and like devices mounted on a wall or ceiling provides a cover member of a generally opaque material approximately the shape of the device it is covering and somewhat larger than the device to be covered. The cover is provided with a plurality of connector resilient legs fixed to the inside of the cover and extending towards the device to be covered in the pattern to engage selected distributed points of engagement. Cam surfaces on the ends of the resilient legs are position to laterally deflect the respective legs when they contact the distributed points of engagement. Forces imposed by the resilience of the legs while deflected are directed in opposition to one another to maintain frictional engagement at respective points of engagement.