Acceleration minus acceleration from rotation

[Richmond]

On 11/02/15 20:04, Colin Holgate wrote:
> 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 gmail.com> 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?].
>

Well one thing I didn't mention in my previous message is that my cat 
has a gyroscope installed :)

Richmond.