Sentence:  Three seconds flat is the usual time , and the space is crossed by moderate mileage , while the overwhelming immensity of such journeys must be conceived as a static <WSD>pulsation</WSD> through an enormous number of coexistent frequencies which perpetuate all events . 
Meaning of the word marked with <WSD> tags:  (electronics) a sharp transient wave in the normal electrical state (or a series of such transients)