Centrifugal Force Demonstration
   When a spherical flask with a small amount of mercury in it is whirled, the mercury forms a band around the middle of the flask. 

   At the left is a flask used with a rotator at Kenyon College. At the right is a rotator and flask at Bowdoin College, and was probably made by Ritchie of Boston. Its cost was $8.00 to $10.00, including the flask, figure of the earth apparatus, and six other demonstrations 

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