Antique Topographical Chart Illustrates Pacific Northwest Flight Corridor
This original document showcases Airway Map Number 138 from May 1931. The Coast and Geodetic Survey produced this colorful technical artifact under the Department of Commerce. The narrow sheet presents a detailed longitudinal view for military and commercial aviators. Bold red vectors point the way across dangerous mountain passes and isolated river valleys.
Early Navigation Grid Links Idaho Airfields to Washington State
The intricate design plots the challenging aerial path from Boise toward Pasco. Varied gradient tints indicate specific land elevations and high peaks along the northwestern route. Essential graphic markers identify Department of Commerce intermediate fields, night lighting stations, and local landmarks. This rare print documents the expansion of early airmail infrastructure across America.
Contributor: US Coast & Geodetic Survey
Date: 1930
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