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of the wire. The figures are not drawn to scale so that they cannot be used as working drawings. Figure 2 for instance shows turns of wire near the centre of the frame. In reality
the turns of wire are placed toward the outer edge of the frame. In general it will be found that a coil antenna such as shown in Figure i is the most satisfactory kind to use. In constructing the antenna, as little metal, as possible, should be used.
The antenna may be hooked up to the receiving set in a number of different ways. If it is desired to use a "tuner," the ends of the wire may be connected directly to the terminals to which the ground and the antenna lead-in wire would be connected if an ordinary type of antenna were used. This hook-up is shown in Figure 4. PC and PI represent the primary
condenser and inductance of the tuner, and SC and SI represent the secondary condenser and inductance. L represents the coil antenna. It is to be noted that no ground connection is necessary.
Although a tuner may be used, none is necessary, for the selectivity is sufficiently sharp to cut out all ordinary interference. The method of connection in this case is shown in Figure 5. There is a variable condenser shunted across the loop and leads from each side of this condenser go to the detector. No inductance is needed, as this is furnished b>' the loop. Again no ground connection is made. This method of connection allows much fainter signals to be