context: In October 1745, Ewald Georg von Kleist of Pomerania, Germany, found that charge could be stored by connecting a high-voltage electrostatic generator by a wire to a volume of water in a hand-held glass jar. Von Kleist's hand and the water acted as conductors, and the jar as a dielectric (although details of the mechanism were incorrectly identified at the time). Von Kleist found that touching the wire resulted in a powerful spark, much more painful than that obtained from an electrostatic machine. The following year, the Dutch physicist Pieter van Musschenbroek invented a similar capacitor, which was named the Leyden jar, after the University of Leiden where he worked. He also was impressed by the power of the shock he received, writing, "I would not take a second shock for the kingdom of France."
question: মূল পরীক্ষায় যেখানে ক্যাপাসিটরের বৈশিষ্ট্যগুলি আবিষ্কার করা হয়েছিল, কোন উপাদানটি ডাইলেট্রিক হিসাবে কাজ করেছিল?
answers: a hand-held glass jar