The system of terrain corrections uses an electronic digital computer for much of the calculation. A new method using a desk calculator is suggested for terrain effects arising from close‐in topography. The present system covers a square area 40 km by 40 km, with the station at the center. A selected group of corrections that were compared with conventionally computed ones agree within 0.1 mgal. The speed of the operation using the Datatron 220 computer is considerably faster than the conventional method of computing.

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Location and accessibility______________________ Surface features________________________________ Settlements and culture.________________________ Climate and vegetation_____,____________________ Prebatholithic geology___----_-.___---_____________ Upper Precambrian(?) and Lower Cambrian sedimentary rocks of the White Mountains.-________ Wyman formation__________________________ Reed dolomite______________________________ Deep Spring formation. _____________________ Campito formation________________________ Andrews Mountain member._____________ Montenegro member.

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