Buffer pH 4,01, red

Replacement Spheres and collars for the Gravitational Torsion Balance (AP-8215A). Designed to convert to Tungsten while maintaining the proper large sphere dimensions.

Set of four 4 oz bottles of mineral oil, for use with the Millikan Oil Drop Apparatus.

Allows the students observation of velocity of drop rising in an electric field, then permits calculation of the force on the charge carried by the oil drop.