ABSTRACT
The employment of electromagnetic waves for purposes of communication is no modern invention; on the contrary, its origins are lost in time. A boy winks; a girl smiles. Communication via the optical electromagnetic frequencies has taken place, although the participants are unlikely to be thinking of the process in those terms. The discovery of means of making fire, the greatest single forward step in human history, put the power of the artificial generation of electromagnetic waves into the hands of primitive man, giving him means to warm himself and cook his food by the use of infra-red frequencies and the facility of communication at night (camp-fires and beacons).
