... the right of the drum (marked with a cross to show that current is moving, as it were, into the page), connected with[Pg 169] conductors on the left (marked with a dot to signify current coming ... This dynamo has its + terminal connected with the insulated or "live" rail of an electric railway, and its – terminal with the wheel rails, which are metallically united at the joints ... lay it across the terminals of an accumulator, it becomes white hot and melts, owing to the heat generated by its resistance to the current. A piece of fine platinum wire would become white...