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CHAPTER V.

Containing a description of a new part added to the common elec-trical machine , and also of some new apparatus to be used with it .

S several of the writers on electricity have already described

JLjL most of the electrical machines which have been, or arestill in use, it will be unnecessary for me to repeat what has al-ready been said by others ; I shall therefore content myself withexplaining those parts which I have added to the common ap-paratus. Fig. i. fee plate I. represents a large table, big enoughto receive upon it a second table, fig. 2. three feet six inchessquare, which is supported by four large and broad glass legs,about 10 inches high. Upon this table, with glass legs, is fixedwith a screw, fig. 3. the frame of the common electrical ma-chine, fig. 4. The two conductors, commonly called the po-sitive and negative conductors, fig*. 5. 5. stand one upon thetable supported by glass legs, the other upon the table whichrests upon the frame communicating with the floor.

The two small coated jars, fig 5 . 6. 6. are suspended by twosmall chains, from the wires of the conductors, about six inchesabove the surface of the upper table. The two metal knobsin contact with the coating of the jars, fee fig 5 . 7. 7. arescrewed upon two curved wires, which are bent in such a form thatthey may nearly meet with their blunted points in the letter a.The two wires are supported by six glass stands, about seveninches high, fee fig 5 . 8. 8. 6cc. each of which has a socket on the

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