'It is an essential link in a dark chain of events which, unless severed, will inevitably engirdle us all.

The read-out which followed, had it been broadcast in standard five-point lettering, would have formed an equation sufficient to engirdle the Earth several times around.

They made the special effects, indeed, wrought in the fluid by special impulses, the subject of exact calculation - so that it became easy to determine in what precise period an impulse of given extent would engirdle the orb, and impress (for ever) every atom of the atmosphere circumambient.