The phase indicator is from a syringe. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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It will take quite a bit of time to make a phase wire indicator from ... a disposable syringe (see figure). Take any neon lamp of suitable size (for example, TN-0,2) and solder a metal pin to one of its terminals - a probe of such a diameter that it fits tightly into the narrow nozzle of the syringe. Connect the second output of the lamp with a stranded wire (in insulation) to a MLT-0,25 resistor with a resistance of 220 kOhm - 1 MΩ, and the resistor itself to a screw inserted into the plug covering the wider end of the syringe. A rubber centering ring can be put on the top of the lamp bulb. Insert the lamp with the pin into the syringe and close it with a stopper.
Having touched the screw with your finger, touch the pin to the parts or conclusions of the electrical circuits under test. When the pin touches the phase wire, the neon lamp starts to glow.
Author: S. Dubovoy, St. Petersburg
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