The paper is concerned with the measurement of dip and strike in the sound exploration record.
The record is influenced in some physical characteristics of the sound; directinality, velocity, exaggeration.
Then, discussed that these influences should be eliminated in the analysis of the record. And finally, dip and strike is measured by two apparent dip in the cross point of observed lines, by the calculation or nomographic methods usually.
The nomographic method is convenient to measure many dip and strike.
It is also introduced in this paper, the compilation and interpretation of the nomograph and the distribution of survey lines.