Tagged with "laser"

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  1. "ring of fire" in math midway

    "ring of fire" in math midway

    Bit

    by Eric Siegel on February 06, 2010

    this is very cool. It is a 4 foot or so diameter ring, with four red laser leds set in every 90 degrees. A kind of horizontal splitter is installed over each laser led. This creates a thin plane...