First Principal Meridian

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The First Principal Meridian begins at the junction of the Ohio and Big Miami rivers, extends north on the boundary line between the states of Ohio and Indiana, and roughly approximates to the meridian of longitude 84° 48' 50" west from Greenwich. The ranges of the public surveys in the state of Ohio, west of the Scioto River, are, in part, numbered from this meridian.

[edit] Source

• Raymond, William Galt (1914). Plane Surveying for Use in the Classroom and Field (via Google Books), New York: American Book Company.