By a very simple calculation, based on the familiar principle of the parallelogram of forces, I gave to the apergic current a force and direction equivalent to a daily motion of about 750,000 miles in the orbital, and rather more than a million in the radial line.

That is to say, it is a long parallelogram with flat sides, raised upon pillars, and approached by a flight of steps.

On the other side Jack found himself surrounded by walls of books, which formed a parallelogram around a great deal table littered with magazines and papers.

She seemed to see it before her eyesa purple eidolon, a parallelogram in shape.