he cork;FIG. 2 is a side elevation of the cork in the position assumed when it is submerged in a fishing hole in the ice, with the line clamped in the coil spring;FIG. 3 is a cross section through the cork; andFIG. 4 is a side elevation showing how the line slides through the cork and, when a fish exerts a pull on the line and the line is reeled.Referring more particularly to the drawings, wherein