The idealized reflection system would be one in which a simple impulse could be generated at the earth's surface, and thereafter would travel downwards in the earth until it encountered a succession of simple strata from each of which a reflection would be returned to the surface. In this ideal system, the direct wave from the explosion would pass the receiving system before any reflected waves had arrived—and hence no disturbance or interference with the reflections would be occasioned by the direct wave.

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