. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . UMBRELLA TYPE ANTENNA, The umorella type antenna,which is only employed whenit is impossible to obtain asufficient span for the type is quite popular intransmission work. RADIO FOR EVERYBODY 103 supply system. Where this is not available, pipes con-nected with the heating o
. Radio for everybody; being a popular guide to practical radio-phone reception and transmission and to the dot-and-dash reception and transmission of the radio telegraph, for the layman who wants to apply radio for his pleasure and profit without going into the special theories and the intricacies of the art . UMBRELLA TYPE ANTENNA, The umorella type antenna,which is only employed whenit is impossible to obtain asufficient span for the type is quite popular intransmission work. RADIO FOR EVERYBODY 103 supply system. Where this is not available, pipes con-nected with the heating or gas system may be used, al-though these are to be regarded with some a non-conducting length of pipe is inserted inthe gas line before it reaches the earth, so that it is not atrue ground connection. However, the results obtainedsoon disclose whether the pipe is grounded or not. At any rate, the pipe selected is scraped with a knife. A convenient manner in which to bring the lead-in wireinto the house. A board of about the same width as thewindow frame is inserted at the bottom or top of the win-dow frame, and the window is then pushed against it so asto shut out the air in cold weather. The lead-in passesthrough a hole in the board, which may be insulated. Thusthe window^ can be raised or lowered without trouble. or rubbed clean with sandpaper until it is bright, andconnection is made by means of ground damps, whichcan be obtained at any electrical supply store, or by wrap-ping ten or more turns of copper wire about the cleanedsection of the pipe, good and tightly so as to make firmcontact. No. 14 wire is preferable for the ground lead,althoug^h anything up to No. 20 will do. Naturally, theinsulation is removed from the wire at the point where itmakes contact with the pipe. If possible, the wire should 104 RADIO FOR EVERYBODY be soldered, for one cannot take too much pains with theground connection. More receivin
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