Magical Yellow Line

I’ve always wondered how they got the line on the football field to show where the next first down was.  Did you know they use sound to do part of it?  Check out this video that explains how it works.

Sorry everyone.  After tinkering with embedding the video for about half an hour I decided to just link to the page instead.  I’m probably performing a newbie mistake but I can’t get the video to embed unless it automatically starts playing (which I don’t want).  Feel free to inform me what I am doing wrong.

The Mystery of the Yellow Line

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