'sGravesande's  Apparatus
This demonstration, known as Gravesande's ring, consists of an iron ball suspended above an adjustable iron ring.  It is used to demonstrate the "cubical expansion of solids".
The ball just fits through the ring at room temperature. When the ball is heated it will no longer pass throug the ring. 
The three brass feet are the same as those found on apparatus made by Daniel Davis.



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