perform the experimental set up according to pic 1 and 2 . insert the two nickel electrodes into two holes in the three hole rubber stopper and fix the terminal screws to the lower ends of the electrodes.screw two pieces of chrome nickel wire , which are each about 15 cm long, into the clamps between these two electrodes so hat they are electrically connected in parallel. the wires must not touch each other. insert the one-way stopcock into the third hole of the stopper and insert the thus-prepared stopper in the lower opening of the bottle.