An Electroscope is used to determine the presence and magnitude of an electrical charge. In this case a flask is used to capture the charge and shield from air currents. An electrical charge is gathered through some outside means such as static discharge, then two thin metal leaves, in this case aluminum, spread apart until the charge is gone.
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This electroscope is housed in a 250ml Pyrex flask with a metal rod attached to a rubber stopper. A pair of aluminum leaves is suspended from an alligator clip. The knob on top of the rubber stopper accepts a charge. When the charge enters the flask, the aluminum leaves separate. Instructions are included with each electroscope. Each electroscope come in a storage box.
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