Underground Rivers

Underground Rivers

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Most everything one could wish to know about the topicHerona#39;s Dioptra (third century BC) describes how to align a tunnel between opposite points A and F in a mountain, a conceptual approach likely ... Turn a right angle from AB and go to a point C far enough that another right angle passes the mountain. ... of B) through point E. Sight from E through F to extend line BF past F. To make the two red triangles in the geometric layout a€œright triangles having legs ofanbsp;...

Title:Underground Rivers
Author:Richard Heggen
Publisher:Richard Heggen - 2015-01-16


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