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    IPhone as artificial horizon
    From: Paul Saffo
    Date: 2008 Sep 9, 13:52 -0700

    It turns out that Apple's iPhone and iPod Touch make a nifty
    artificial horizon.  Both devices have built-in angle/acceleration
    sensors, so If one downloads Labyrinth Lite (currently the most
    popular game download for the iPod), it has a set-up feature that
    displays two right-angle leveling bubbles.  Use a couple of Post-its
    to shim it into level and the screen makes a small but effective
    sighting surface!  I haven't actually tried to measure the leveling
    sensitivity, but my wild guess (based on how hard it isto chase the
    bubble) it is something like a 10 - 30 min bubble equivalent.
    
    -p
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