This was a hasty applet made to help out a friend in a pinch.  She needed to calculate the cubic volumes
  of a box with two compartments:  the lower with a heater element, the top with a baby bird.  A bird incubator. 
  It was thrown together in a day, and she had boards ordered cut to her chosen dimensions the next day. 
  The graphic was done free-hand on MS Paint. 
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