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| This highly informative 32" x 20" antique map, titled "Geological Map of U.S. - Isothems Temperature & Rain fall," was published by G.W. Gray & Son, a prominent Philadelphia firm established in the late 1860s and recognized for producing one of the most successful atlases. Likely dating from the 1870s, this rare map uniquely combines geological features with climatic data, showcasing isotherms (lines of equal temperature) and rainfall patterns across the United States. It's a testament to the scientific and cartographic advancements of the era, reflecting an early attempt to visually represent complex environmental data. As "one of the last to employ hand coloring on maps," G.W. Gray & Son's attention to detail makes this an exceptional piece for collectors of antique scientific maps, historical geologists, or anyone interested in the intersection of cartography and environmental science. |
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