Sketch Showing the Progress of the Survey in Sections XIV and XV. Geodetic Connection of the Atlantic and Pacific Coast Triangulations, Missouri and Illinois

An inland geodetic triangulation of a swath across Missouri and Illinois. Progress of the transcontinental triangulation and reconnaissance efforts to link the west and east coasts are shown with many base stations and triangulation points. The map shows the swath along the Missouri River from east of the confluence with the Mississippi River. Also shown are place names and triangulation stations.

IMPORTANT NOTE:

All of our United States Coast Survey (USCS), United States Coast & Geodetic Survey (USC&GS), and similar maps and charts have been professionally unfolded and flattened using humidity baths, semi-permeable membrane and drying blotter techniques.  Most others you typically see on eBay have not been, and worse, are quickly and crudely unfolded for the low quality photos you see.  Unfolding these maps in that way is damaging and weakens them. Please be aware.