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The dot chart described in this paper is an adaptation of Hubbert’s graticule (1948). Like Hubbert’s graticule, it offers the field man, who does not have ready access to digital computers, a rapid method of calculating theoretical profiles due to two-dimensional bodies of infinite length. Since many geological features may be treated as twodimensional bodies, the dot chart is a useful tool instead of a geophysical curio.

The dot chart retains the capability of lineal integration provided by Hubbert’s graticule while, at the same time, it offers an intuitive insight to profile matching. The chart may be modified for bodies of finite length by the addition of partitioning circles. The body’s cross section may be modified for calculation of magnetic attraction.

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