pl23_map00139.jpg

The prototype 3-D image of the seafloor developed by Heezen and Tharp. Note the similarity to the Veatch and Smith map in image map00125. The Veatch and Smith map had been produced as a 3-D relief model by the Braund Reliefograph, amachine developed within the C&GS; to produce relief models for WWII bombardiersand pilots.