GUIDE MERIDIANS

  3-14. Guide meridians are extended north from the base line, or standard parallels, at intervals of 24 miles east and west from the principal meridian, in the manner prescribed for running the principal meridian. The guide meridians are terminated at the points of their intersections with the standard parallels. The guide meridian is projected on the true meridian, and the fractional measurement is placed in the last half mile. At the true point of intersection of the guide meridian with the standard parallel a closing township corner is established. The parallel is retraced between the first standard corners east and west of the point for the closing corner, in order to determine the exact alinement of the line closed upon. The distance is measured and recorded to the nearest corner on the standard parallel.


Figure 15. - Survey of Quadrangles, each embracing 16 townships bounded by standard lines, showing the coordinate system of numbering townships.
Click to enlarger image

  3-15. When existing conditions require that guide meridians be sun south from the base or correction lines, they are initiated at the theoretical point for the closing corner of the guide meridian, calculated on the basis of the survey of the line from south to north initiated at the proper standard township corner. At the theoretical point of intersection a closing township corner is established.

  3-16. Where guide meridians have been placed at intervals exceeding the distance of 24 miles, and new governing lines are required, a new guide meridian is established, and a local name is assigned, such as "Twelfth Auxiliary Guide Meridian West," or "Grass Valley Guide Meridian." Auxiliary guide meridians are surveyed in all respects like regular guide meridians.