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Updated: April 30, 2025
The Leyden jar is illustrated in figure 9, and consists in general of a glass bottle partly coated inside and out with tinfoil F, and having a brass knob K connecting with its internal coat. When the charged plate or conductor of the electrophorus touches the knob the inner foil takes a positive charge, which induces a negative charge in the outer foil through the glass.
My Thursday was drawing to a close; I had to return to Avignon, to resume my lessons on the electrophorus and the Toricellian tube. O happy Thursdays! What glorious opportunities I lost because you were too short! We will go back a year to continue this history.
The process can be repeated as long as the negative charge continues on the resin. These tiny sparks from the electrophorus, or the bigger discharges of an electrical machine, can be stored in a simple apparatus called a Leyden jar, which was discovered by accident.
This property of the medium is termed its INDUCTIVE CAPACITY. The Electrophorus, or carrier of electricity, is a simple device for developing and conveying a charge on the principle of induction.
This is called connecting "in parallel," or quantity, and gives a big, but not a long spark. Of late years the principle of induction, which is the secret of the Leyden jar and electrophorus, has been applied in constructing "influence" machines for generating electricity.
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