For demonstrates of the basic principle of capacitance. Consists of two cylindrical, aluminum, conducting cups, one placed inside the other and separated by an insulating, and dielectric, plastic cup. The inner cup has an aluminum rod, which terminates in an aluminum ball. The apparatus can be easily taken apart. Once charged while assembled, it retains its charge even after disassembly and reassembly. With instructions.
No-5309/27, Punjabi Mohalla, Ambala Cantt, Haryana, 133001, India