(World - Thematic) Messages Under The Ocean physics and this map

and this map

Perhaps the most uncommon map of the territory

this map is well detailed but not too dense

Dense with soundings for the ocean's depths

and little is shown to exist once you leave the path of the tracks

(World - Thematic) Messages Under The Ocean physics and this map(World Thematic) Messages Under The Ocean, Anon., 1939We probably can't imagine what a world connected by wire meant at the moment. If wars erupted for lack of clear and timely communication, this could be the remedy. If parts of the world were more remote and lagging behind, they could be brought into dialogue with the latest events, at speeds of up to 130 words a minute. This set of illustrations addresses this modern wonder, showing the components