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Plate 31, Coast Survey Report 1865 by E. Hergesheimer. These diagrams arebelieved to include all possible conditions of the relation of the position ofan undetermined point to three fixed points. A discussion of this diagrambegins on page 215 of the 1865 Annual Report within Appendix No. 22, On thePlane-Table and Its Use in Topographical Surveying. (Image credit: NARA C&GS; Colllection)