Excerpt from A Treatise on the Principles and Practice of Levelling: Showing Its Application to Purposes of Civil Engineering, Particularly in the Construction of Roads

The figure of the earth is not exactly that of a sphere, but of an oblate Spheroid ﬂattened at the poles the length of the equatorial diameter being 7924 miles, and that of the polar diameter 7898 miles. For our present pur pose, it is sufficiently correct to consider it as a Sphere.

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