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Bench-Mark

1911 Encyclopedia Britannica

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• Bench Mark
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1911 Encyclopedia Britannica
• Bench-Mark

A surveyor's mark cut in stone or some durable material, to indicate a point in a line of levels for the determination of altitudes over a given district. The name is taken from the "angle-iron" which is inserted in the horizontal incision as a "bench" or support for the levelling staff. The mark of the "broad-arrow" is generally incised with the bench-mark so that the horizontal bar passes through its apex.