The document discusses high voltage measurement techniques including using a voltage divider rule to measure high voltages. It explains that for direct current, electric lines of force are static but for alternating current, charge density is a periodic function of time. It also covers energy storage in capacitors using the equation that energy density equals one half the permittivity of free space multiplied by the electric field strength squared. Safety clearances for high voltage equipment are discussed including the air gap and spark point height above ground or other objects.