Excerpts from the description. Coal, copper, salt, iron, magnetite, water. Oiled keys rotate quickly in four vessels .
we fill the jar with coal, salt, copper and insert the steel rod. What is it? right ... a copper-iron salt battery 60cm high and 1.2 meters in diameter. But it should somehow rotate. Why magnetite?
This is a magnet. A moving charged particle is deflected in a magnetic field. All this leads to Faraday’s disk.
Well, now everything is simple ....
Need to get zinc. To do this, I disassembled an ordinary battery. Need a top zinc cylinder. The rest is not needed. This cylinder must be well cleaned and cut into 4 or more parts. Straighten the notched parts and bend the already flat outward at a small angle. This is necessary so that the current passing through these petals would be across the magnetic field of the permanent magnet. A central pin must be made from an insulated rigid copper wire. This will be the axis on which the zinc cylinder will rotate. In the video, this is a blue wire drawn along the wall of a can and clamped on the edge. The top of the axis must be cleaned from insulation and sharpened. Here you need a good contact between the axis and the cylinder. At the edges of the jar you need to place something copper on the ring. Bare copper wire, for example. The bigger, the better. But do not allow contact with the petals of the cylinder. Put a magnet under the can. Well, that’s it. Carefully pour the electrolyte (sulfuric acid). Carefully put the cylinder on the axis. Close external contacts and admire the rotation. It is necessary to smooth out the inner contact surface of the cylinder with the axis to a shine. There oxide can interfere. Caution with acid. The voltage will be about 1 volt. Current within one ampere. If you make three of these elements and connect in series, you get more than 3 volts.And now you can connect the load in the form of a light bulb, etc. ask what is incomprehensible do not be shy. good luck.