Encyclopaedia Britannica, 11th Edition, "Geodesy" to "Geometry"

This slice of the Eleventh Edition of the Encyclopædia Britannica brings together the foundational sciences of geodesy and geometry in a single, well‑structured collection. Written at the turn of the twentieth century, the entries combine rigorous description with the historical perspective of the great French astronomers and surveyors who first measured the Earth’s shape. Readers will encounter clear explanations of how triangulation, baseline measurement, and astronomical observations combine to produce the maps and standards that still underpin modern navigation.

The narration guides listeners through the practical challenges of early surveying—temperature‑affected measuring bars, the invention of compound metal thermometers, and the mathematical models that approximate the planet’s surface as a plane, sphere, or ellipsoid. Alongside these technical insights, the volume offers concise biographies of notable figures and concise definitions of related terms, making it a valuable reference for anyone curious about the science that turns the Earth into a measurable, navigable space.