Early geophysical papers of the Society of Exploration Geophysicists . earlygeophysical00soci Year: 1947 THEORY OF SEISMIC PROSPECTING 37 Fig. 2 are parabolas. When t? is greater than a the iso-time curves have two branches and are hyperbolas. As is well known (see Osgood and Grausteins' Plane and Solid Analytical Geometry, 1927, p. 144) the foci can be constructed bv 281

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