A translator which can only convert EM to scalar or scalar to EM is known as a 'one-way' device. There are certain types of translators which are capable of converting freely from EM to scalar and back. These devices are known as 'two-way' devices.
Lets take a closer look at some of the one-way devices.
Consider the common two conductor lamp cord used on many lights, small appliances, and radios. This cord is commonly referred to as 'zip cord'. As the current surges through the first wire, the second wire is carrying the return current in the opposite direction. The EM fields whirling about the conductors are in opposition. Up until now, most of you were taught that the fields, while in opposition, 'cancel' each other out.