Acceleration minus acceleration from rotation

Colin Holgate coiin at
Wed Feb 11 13:04:50 EST 2015

Later devices have gyroscopes, that can detect non-rotation movement. That may help solve the original problem.

> On Feb 11, 2015, at 12:59 PM, Richmond <richmondmathewson at> wrote:
> >What my iPad CANNOT do, is detect if it is moved across a surface, for the very SIMPLE reason that it doesn't have
> "little wheels" or other motion sensors on its underside [ err . . . backside?].

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