| 摘要 |
A hollow tube capable of passing one or more turns of fishing line through its bore is encased by a spheroidal bubble member, creating an airtight chamber between the tube and the bubble member. Within this airtight chamber a predetermined amount of high density lead metal shot allows predetermination of the aggregate weight and density of the casting bubble. The weight is important during casting and the density is important for controlled flotation during lure retrieval. The shifting high density material changes the center of gravity of the weighted casting bubble between those times when the bubble is cast and during its retrieval. During retrieval the weighted casting bubble resists angular rotation.
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