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* [http://tonyforster.blogspot.com/2011/05/graphing-pitch-and-volume.html Graphing pitch and volume]
 
* [http://tonyforster.blogspot.com/2011/05/graphing-pitch-and-volume.html Graphing pitch and volume]
 
* [http://tonyforster.blogspot.com/2011/06/orbital-motion.html Orbital motion] [[File:Turtle Art Activity orbital.ta]]
 
* [http://tonyforster.blogspot.com/2011/06/orbital-motion.html Orbital motion] [[File:Turtle Art Activity orbital.ta]]
* Turtle spirit level for the XO-1.75 [[File:Turtle Art spirit level.ta]]
+
* [http://tonyforster.blogspot.com/2011/08/xo-175-accelerometer.html Turtle spirit level for the XO-1.75] [[File:Turtle Art spirit level.ta]]
    
An bringing it all together, [http://tonyforster.blogspot.com/2009/03/turtle-oscilloscope.html the Turtle Art Oscilloscope].
 
An bringing it all together, [http://tonyforster.blogspot.com/2009/03/turtle-oscilloscope.html the Turtle Art Oscilloscope].
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