this is what you get when you go to this render:
The History Of Radar Detectors
If you know units of measurement, then you are aware of the unit Hertz. The scientist Heinrich Hertz was conducting experiments in the latter half of the 19th century to prove the point that radio waves were reflected by metallic objects. The phenomenon of electromagnetic waves and the work expounding on this had hinted at this possibility.
However, the early 20th century was the time frame during which equipment that used this technology widely. Christian Hullsmeyer, a German inventor was the one who was responsible for using this theory to build something that detected ships so that collisions in inclement weather could be avoided. The next two decades saw a prolific rise in devices that employed this technology.
hee hee hee