t M 1

(see, experiment III. p, 64,) and like , the needles in the last:experiment.

Experiment X. with two jars charged at separate conductors,with a communication between their outside coatings .

Place a coated jar at each conductor, and charge them. Whencharged, take them away from the conductors, and place themupon the table with the vanes parallel; when they are broughtwithin the sphere of, attraction, they will mutually attract eachOther, and there will be a spark and a discharge of the jars.

Experiment XI. with two charged jars and a pith-balh

Take off the vanes from the jars, and screw on a brass knobto each wire, .and charge the jars at separate conductors as be-fore. Take the jars from the conductors and place them uponthe table within two or three inches of each other, accordingto the strength of the charge. If the charge be strong, takea cork-ball, the size of a large hazei-ouat, suspended by a silkenthread from a stand, that it may hang between the knobs of thejars ; the ball will then be mutually attracted and repelled bytire knobs. If you bring the knobs of the two jars within, an.inch, more -or less, (for experience must fix the distance) thesuspended cork-ball will appear to be whirled round" betweemthem with great rapidity ; but it does not go quite half wayround before it is forced back again by the opposite knob. Ifthe knobs of the jars are brought very close together, and thecork-ball has only room to play between them, it will make ahumming noise like a fpinnlng-top.

If