PURPOSE: Fancy demonstration of the Crookes' radiometer.

DESCRIPTION: This is simply two identical except oppositely oriented Crookes' radiometers. When heated from one side they rotate in opposite directions.

SUGGESTIONS: THIS APPARATUS HAS BEEN BROKEN AND IS THEREFORE TEMPORARILY OUT OF SERVICE.

REFERENCES: (PIRA 4D20.10)

EQUIPMENT: Double Crookes' radiometer with matches.

SETUP TIME: None.