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 July 14th, 2012, 03:19 AM #1 Newbie   Joined: Nov 2011 Posts: 3 Thanks: 0 What is directrix line of parabola used for? As I understand, a focus point of parabola is used for locating a focus point of a signal when we design an antenna. What about the directrix line? Is there any example of its application?
July 14th, 2012, 05:47 PM   #2
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Re: What is directrix line of parabola used for?

Quote:
 Originally Posted by pionixstar90 What about the directrix line? Is there any example of its application?
It's used for the cable of a suspension bridge or high tension power line; other uses are similar; example ski lifts or suspended gondolas.
Undersea tunnels or fiber optic cables.

 July 15th, 2012, 05:07 AM #3 Global Moderator   Joined: Dec 2006 Posts: 20,927 Thanks: 2205 How is it related to undersea tunnels?
 July 15th, 2012, 05:22 AM #4 Senior Member   Joined: Jun 2011 Posts: 298 Thanks: 0 Re: What is directrix line of parabola used for? Ground water seepage
February 21st, 2013, 08:19 PM   #5
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Re: What is directrix line of parabola used for?

Quote:
 Originally Posted by pionixstar90 As I understand, a focus point of parabola is used for locating a focus point of a signal when we design an antenna. What about the directrix line? Is there any example of its application?
To construct the parabola?

http://quadrivium.info/GGB/ParabRhombus.html

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