The article discusses the theory of the electric charge in a Leyden jar, focusing on the phenomenon of the initial rapid decrease in voltage at the jar's knob and the subsequent formation of an electric charge. The author, R. Kohlrausch, presents experimental results using a sinusoidal galvanometer and a multiplier to study the behavior of the charge over time. Key findings include: 1. **Rapid Voltage Drop**: The initial rapid voltage drop is attributed to factors other than the loss of electricity to the air. 2. **Residual Charge**: After discharging, the jar shows a significant charge of the same type, indicating the presence of a hidden charge. 3. **Charge Distribution**: The available charge in the jar is proportional to the voltage at the knob, and the hidden charge is determined by the difference between the initial charge and the available charge. 4. **Glass Surface and Binders**: The author investigates the role of the glass surface and binders in the formation of the hidden charge, concluding that the glass surface and binders have minimal impact. 5. **Glass Thickness**: The thickness of the glass affects the amount of charge collected as a residual charge, with thicker glass producing a larger charge. The article concludes with a hypothesis that the formation of the hidden charge is related to the movement of electricity between the glass and the contact points, but acknowledges the complexity of the phenomenon and the need for further research.The article discusses the theory of the electric charge in a Leyden jar, focusing on the phenomenon of the initial rapid decrease in voltage at the jar's knob and the subsequent formation of an electric charge. The author, R. Kohlrausch, presents experimental results using a sinusoidal galvanometer and a multiplier to study the behavior of the charge over time. Key findings include: 1. **Rapid Voltage Drop**: The initial rapid voltage drop is attributed to factors other than the loss of electricity to the air. 2. **Residual Charge**: After discharging, the jar shows a significant charge of the same type, indicating the presence of a hidden charge. 3. **Charge Distribution**: The available charge in the jar is proportional to the voltage at the knob, and the hidden charge is determined by the difference between the initial charge and the available charge. 4. **Glass Surface and Binders**: The author investigates the role of the glass surface and binders in the formation of the hidden charge, concluding that the glass surface and binders have minimal impact. 5. **Glass Thickness**: The thickness of the glass affects the amount of charge collected as a residual charge, with thicker glass producing a larger charge. The article concludes with a hypothesis that the formation of the hidden charge is related to the movement of electricity between the glass and the contact points, but acknowledges the complexity of the phenomenon and the need for further research.