Descrição do livro
Bulletin, Issues 465-469 provides a detailed account of early 20th-century spirit leveling in Texas, focusing on Part 3 of a four‑part report (1896–1910). The work compiles primary elevations across multiple quadrangles (Rockwall, Dallas, Sealy, Brenham, Bryan, Hearne, Temple, Waco, Austin, Bandera, Blanco, and adjacent areas) derived from Coast and Geodetic Survey bench marks, with field work conducted circa 1909–1910 and state cooperation. It documents datum adjustments, such as a fixed San Antonio city bench mark (653.212 feet above mean sea level) and notes on prior line errors requiring corrections. Each station entry lists precise location cues (roads, bridges, landmarks), the marker type (aluminum tablets, copper bolts, iron posts, nails in trees), and elevation values in feet, often with contextual remarks about marker position. The volume is organized by quadrangle under headings like Primary Leveling, followed by station-by-station listings, and includes narrative notes on accuracy and cross‑line consistency. The report exemplifies meticulous surveying practices shaping a consistent vertical datum for Texas infrastructure.
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