From: https://commons.wikimedia.org/wiki/File:Map_Showing_the_Telegraph_Lines_In... Uploaded by SpanishSnake. Last modified about 6 years ago. 8 control points.
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File:Map Showing the Telegraph Lines In Operation, Under Contract, and Contemplated to Complete the Circuit of the Globe, 1869.jpg
From: https://commons.wikimedia.org/wiki/File:Map_Showing_the_Telegraph_Lines_In... Uploaded by SpanishSnake. Last modified about 6 years ago. 8 control points. Links: Wikimedia Commons
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