Two plates, as printed
1857 beside 1847
Nothing is redrawn. Each column is what that sheet actually shows. Read both records before deciding they rhyme.
1857
U.S. Coast Survey — San Francisco Bay and the California coast
U.S. Coast Survey, under A. D. Bache
Period original
What this plate depicts
A surveyed California coast: triangulation, shoreline, San Francisco Bay, depth of survey notes. The peninsula is attached to the mainland. The bay is a measured harbor, not a gulf that makes California an island. Issued about eight years after the gold-rush population jump; related city sheets of this survey generation show San Francisco still hugging the waterfront, with Yerba Buena Cove already in the process of being filled. The name on the American survey is San Francisco, not Yerba Buena (the pueblo was renamed in 1847).
- Source
- Geographicus / Wikimedia; Coast Survey sketch of Section X, Point Sal to Tomales Bay, 1857.
- License
- Public domain (U.S. government work).
1847
Mapa de los Estados Unidos de Méjico
John Disturnell (after White, Gallaher & White, 1828)
Period original
What this plate depicts
Mexico as Disturnell issued it in 1847, including Texas and Alta California. Upper California is on the sheet as Mexican territory at the moment the war map becomes a treaty map. Later boundary commissions found Disturnell’s El Paso too far north and east of the ground. Record the plate as printed: a New York publisher’s Mexico, attached to a peace, with errors that then had to be surveyed out. Do not silently correct the El Paso error on this image.
- Source
- University of Texas at Arlington Libraries Special Collections; the 1847 edition used in Treaty of Guadalupe Hidalgo copies.
- License
- Public domain.