By connecting low wattage neon lamps in parallel with the different portions of an alternating current circuit the phase differences in these parts may be made visible by the rise and fall of the glow in the corresponding lamps.
Proceedings of the Iowa Academy of Science
©1928 Iowa Academy of Science, Inc.
Spinney, L. B.
"Visible Phase Relations in an A.C. Circuit,"
Proceedings of the Iowa Academy of Science, 35(1), 254-254.
Available at: https://scholarworks.uni.edu/pias/vol35/iss1/54