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68
Radio Broadcast
If there is an aerial but no ground available, this same hook-up may be utilized in place of a ground connection by merely connecting the aerial lead-in instead of the ground connection to post No. 4.
HINTS TO THE EXPERIMENTER
1 WOULD suggest that the coils be wound on a thin bakelite or impregnated cardboard tube. The two windings may be separated by a thin piece of writing paper or empire cloth and a thin coat of shellac may be applied to each winding as it is finished, to hold it in place and to exclude moisture. After each coil is shellacked, it is a good plan to touch a match to
it and let the alcohol burn out. This bakes the shellac into the winding, driving out all of the moisture, and does not burn the insulation. If it is desired, either the finished coil or condenser may be purchased ready to use.
After the condenser and filter coil have been mounted on the panel and the unit completely assembled, it can be fastened in a cabinet by means of small wood screws.
In congested localities, where interference prevails, the wave-trap is certainly an indespensable accessory for perfect reception. It is not only the solution of the interference between local stations, but adds immeasureably to the opportunity for long distance reception.
AN
EYEFUL GETTING AN EARFUL
When Johnny Hines, having "slipped the cans on," listens enraptured through a phone-cord made of clothes-line, nothing short of Hope Hampton, co-star in "Classics of the Screen," can wrench the observer's fascinated eye away from him