Electroscope in a glass flask with two leaves

MACHINE TRANSLATION (not authorised yet)

Double-bulb electroscope designed for electrostatic experiments - detection and determination of electric charge. Vertical, metal rod has two aluminium leaves suspended on hooks, and at the top it is finished with a disc-shaped discharge electrode insulated from the housing with a rubber plug. The casing is a glass (and therefore fully transparent) conical flask of approx. 250 ml.