Type K Precision Potentiometer, or variable resistor, manufacured by Leeds and Northrup. This type of instrument is also known as a slide-wire potentiometer. The metal settings and drum are tarnished.
Transhorizon vhf and uhf fields exhibit deep fades or large signal enhancements of several hours' duration, as the propagation mechanism alternates between partial reflection and scattering caused by turbulent dielectric fluctuations in the...