Back before cell phones … before video games … before television … even before electric radios, there were crystal radio receivers. In the early 1920s and 1930s, magazines offered instructions on how ...

Marked: "Martian / Big Four / Newark, New Jersey / Pat. Pend.". A crystal radio detector with binding posts for headphone connections on top, posts for antenna and ground connections on bottom.

No nameplate or maker's marking. A fixed inductance coil with sliding control and crystal detector. Inductance of the tuning coil is varied by a slider. Binding posts on wooden base. A .0003 mfd.

Of all the horrors visited upon a warrior, being captured by the enemy might count as the worst. With death in combat, the suffering is over, but with internment in a POW camp, untold agonies may ...

Built in 1938 by Edwin Howard Armstrong, the 425-foot structure remains one of the tallest landmarks in Bergen County.

Did you know you can build your very own working 3D-printed radio — without any soldering, electronics experience, electric cord, or even batteries? That’s exactly what talented Houston, Texas-based ...