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Show Tube Insurance That Is Worth Remembering Probably many tubes are burned out v"y year by accidentally connecting f'Eh-voltage "B" battery across their "ament terminals. There are many M to prevent such an accident happening, and one of the easiest t0 connect a high. resistance in the S'lve lead to the "B" battery. An a"iary 'O-watt electric-light bulb is e high resistance which may be a-u for this purpose. If the use of be t, P eauses a howling noise to denser"1' Sl'''"U U W'Ul 3 1 "" Cn' |