The Geochron allows any observer to determine what time it is anywhere in the world. The colorful map is an endless belt that is driven slowly from left to right by an electric clock motor in synch with the rotation of the earth. Time zone boundaries are delineated on the map by dark blue lines which converge on lettered pointers on the top edge of the map. These letters identify the standard time zones and also represent the short wave radio prefix for that zone.
Chicago Division Blue Line Map Detail - Wicker Park Neighborhood Digital Print
A map of the worldwide distribution of supervolcanoes. The light reddish lines are subduction zones, the thick blue lines are mid-ocean ridges, and the size of the circles scales with the magnitude of supervolcanoes
The European Theatre was an area of heavy fighting across Europe from September 1, 1939 through May 8, 1945. Allied forces fought the Axis powers in three theatres: the Eastern Front, the Western Front and the Mediterranean Theatre. This map indicates war zones that were established to ensure that all areas of the war were accounted for by each Allied country.