In November, 1953, a paper by the writer entitled “Limitations of Reflection Seismograph” was published in the Bulletin. This paper considered the problems and precision of the reflection seismograph methods which at the time involved only split spreads and end-on spreads.

During the past 5 years these methods have been replaced largely by field techniques that entail multiple shots or drops per spread that are spaced theoretically on the basis of geometric relations. These systems generally are termed “stacking” and in final presentation the multiple records have been adjusted and combined using stepout corrections instrumentally. Figure 1 shows this...

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