Simple devices constructed from such readily obtainable items as triangles, protractors, plastic rulers, and steel straight edges are described for the graphical solution of two problems which often arise in seismic computations. One problem is to find the minimum-time path between two points located in media with different seismic velocities separated by a plane interface. The other is to find the refracted ray where the incident ray to an interface and the velocities of the media on either side are known.

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