Braun and Leaf electroscopes.

5A10.10 • D+10+8

Braun and Leaf electroscopes. There are two types of electroscopes to show. The Braun electroscope has a light-weight metal pointer on a needle-point suspension. Touching the top metal disk with a charged object causes the pointer to move to a position proportional to the amount of charge applied. The Leaf electroscope has a delicate metallic leaf on a hinge, enclosed in a glass-sided metal housing. Touching the ball of the electroscope with a charged object causes the leaf to rise. The Braun electroscope is adequate for most situations, but is somewhat less sensitive than the leaf electroscope. Charged rods or the electrophorus apparatus can be used to charge either electroscope. See D+10+4 for more information.