It is common practice for authors of geophysics textbooks to correct for the Bouguer effect by using the gravitational attraction due to an infinite horizontal slab of material (Dobrin, 1960, p. 189; Griffiths and King, 1969, p. 142; Heiland, 1940, p. 137; and Howell, 1959, p. 221). Such a slab of thickness h and density ρ will give rise to an acceleration a=2πλρh, where λ is the universal gravitational constant.

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