ASSOCIATED RESEARCH

ELECTRICAL MEASURING INSTRUMENTS-NAMELY, APPARATUS FOR DETERMINING THE VOLTAGE AT WHICH ELECTRICAL INSULATION BREAKS DOWN, INSTRUMENTS FOR MEASURING THE RESISTANCE OF ELECTRICAL GROUNDING CONNECTION TO THE EARTH, INSTRUMENTS FOR MEASURING THE ELECTRICAL RESISTANCE OF ELECTRICAL INSULATION, AND REPLACEMENT PARTS FOR ELECTRICAL MEASURING INSTRUMENTS-NAMELY, VOLTMETERS, AMMETERS, [ GALVANOMETERS, VIBRATORS, ] SWITCHES, POTENTIOMETERS, AND CURRENT TRANSFORMERS