In this week's podcast, Storm Whistle inventor and high school chemistry teacher Dr. Wright explains the various mysteries and origins of the traffic light. We chat about flag-twirlers, a horn-operated traffic signal (a.k.a. the worst idea ever), and the possibility of getting arrested.
Showing posts with label traffic signals traffic lights railroads semaphores Dr. Wright Storm Whistle audio actuated traffic signal cleveland Ohio William Potts Garrett Morgan Chicago LEDs snow. Show all posts
Showing posts with label traffic signals traffic lights railroads semaphores Dr. Wright Storm Whistle audio actuated traffic signal cleveland Ohio William Potts Garrett Morgan Chicago LEDs snow. Show all posts
Thursday, May 19, 2011
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