The Parts and How to Connect Them Up.--Get (1) _two honeycomb or other coils_ of the greatest wave length you want to receive, for in order to properly balance the aerial, or primary oscillation circuit, and the closed, or secondary oscillation circuit, you have to tune them to the same wave length; (2) two _.001 mfd. variable condensers_, though fixed condensers will do, and (3) two small _single-throw double-pole knife switches_ mounted on porcelain bases.

ABOUT