Much of the present seismic work is being carried out in areas where results are difficult to obtain. The paper outlines the requirements for seismic instruments for these operations. The particular characteristics desired for specific problems are illustrated, and the instrument factors that affect these characteristics are outlined. Examples of the effect of instrument adjustment are shown. The attainment of optimum results with present equipment under diversified field conditions may require modifications according to area, in shooting techniques, geophones, amplifiers, galvanometers, recording, and record presentation. The discussion of the advantages of magnetic recording assumes that the best field techniques have been applied.

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