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Instructions for aerological observers (1921)

United States. Weather Bureau, Cloud, W. S, Gregg, Willis Ray, 1880-1938, Jakl, Vincent Edward, 1880-, Lane, Russell Charles, 1893-, Samuels, Leroy Thomas, 1893- · Washington : Govt. print. off. · leaf 91

An illustration from Instructions for aerological observers, 1921, leaf 91
Ki(i. M. Mullooii-fillinK appanitus used for '‘defiiiito” inflation ( r, ihreeway stopcock; A, liydroKci line; iV, filler nozzle; 7', lead Inhin^'; (J, rul)l>er U-lube; II', counterweight).

Meteorology · Aeronautics in meteorology

Internet Archive · University of Illinois Urbana-Champaign · Public domain (published before 1931). Free to use for anything.

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