"I found out that the researchers were misled by wrong instruction books, and by one-sided instruments. Voltmeters and Ampere meters are one-sided. They only show what is called by instruction books, positive electricity, but never show negative electricity. Now you can see that one-half of the electricity escaped their notice. If the researchers had used the same kind of equipment I use to demonstrate what magnetic current is, they would have found out a long time ago what electricity is. The positive electricity is composed of streams of north pole individual magnets, and negative electricity is composed of streams of south pole individual magnets. They are running one stream of magnets against the other stream in whirling right hand twist, and with high speed." EDL.
If a Galvanometer shows us that "The direction of deflection of the needle changes with the change in the direction of flow of the current" then possibly Ed is onto something whe he says that voltmeters are one sided.