1877 US Coast Survey Progress Sketch Map California San Diego to Point Sal LA For Sale

1877 US Coast Survey Progress Sketch Map California San Diego to Point Sal LAAn authentic, original 1877 antique coastal triangulation chart covering the crucial maritime paths of Southern and Central California. Formally designated as Section X (Lower Sheet), this survey maps the Pacific coastline from San Diego Bay northward past the Los Angeles Basin, Santa Barbara Channel, and up to Point Sal (just south of San Luis Obispo.the chart reveals the expansive network of primary and secondary geodesic triangulation webs used by 19th-century cartographers. It explicitly details offshore locations like San Clemente Island, Santa Catalina, Santa Cruz, and Santa Rosa Island, as well as early coastal geography.It measures 22\" by 31\".