The Knight Crystal Set is easily constructed and operated. It provides a simple approach to set building and to the elements of radio communication. A fine operating radio set, it uses few parts, needs no power supply, has a minimum of adjustments and will give clear reception over a limited area. This crystal set is designed to give maximum selectivity in metropolitan areas where several high-powered radio stations may be found. However, in regions where this selectivity is not necessary, it may be easily adjusted to provide maximum sensitivity by means of extra taps placed on the secondary winding while constructing the coil. This adjustment will be explained later in the text.