Sentence:  The Leyden <WSD>jar</WSD> is charged, like the condenser of Œpinus and the fulminating square, by making one of the armatures communicate with the earth and the other with the electric source. 
Meaning of the word marked with <WSD> tags:  (container) A small, approximately cylindrical container, normally made of clay or glass, for holding fruit, preserves, etc., or for ornamental purposes.