Equal Polarization Atmosphere North & South Hemispheres 1854 Blackwood mapMap of Lines of Equal Polarization in the Atmosphere. (World Maps, Atmospheric Maps, Northern Hemisphere, Southern Hemisphere, Magnetic Zones). Issued 1854, Edinburgh by William Blackwood and Sons. Engraved by W & A. K. Johnston. Detailed and lovely large mid 19th century color lithographed folio map with piano key border. Fine decorative appeal. Well preserved, nice looking example with pleasing age patina. Original center fold as issued. Sheet
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Equal Polarization Atmosphere North & South Hemispheres 1854 Blackwood map