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The Phone Company had to make "ring voltage," normally 90VAC at 20 cycles, using special Ringing Voltage Generators. A regular electric motor drove a magneto (similar to the ones that were cranked by hand on phones), to provide ringing voltage.
Molecular weights can be found in the NIOSH Pocket Guide to Chemical Hazards, chemical supplier lists, the NIST Chemistry WebBook or other online databases.. The numeric value of 24.45 in both formulae is the molar volume of air in litres at normal temperature and pressure (NTP), which is considered to be 25ºC and 1 atmosphere (101.325 kPa or 760 mm Hg or 760 torr).