Abstract
TYPES of neon vacuum tubes recently placed on the market as low candle-power glow lamps for household electric lighting circuits, apart from other uses, have several convenient applications in laboratories as indicators to show when the supply current is flowing in any given circuit. These lamps, which are said by the makers to give only 1/4 c.p., have a very high resistance and small current consumption: one type tested on a 200-volt circuit took either 3 or 10 milliamperes, according to the polarity of the connections, while another type took 12 and 30 milliamperes under the same conditions, though individual lamps of the same type vary considerably. In each case the lamp behaved well with a resistance of more than 20,000 ohms in series, and a current consumption of less than one milliampere.
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DENHAM, H. Pilot Lamps in Laboratories. Nature 109, 683 (1922). https://doi.org/10.1038/109683c0
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DOI: https://doi.org/10.1038/109683c0
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