The burning heather had been extinguished, but the level ground towards Ottershaw was blackened as far as one could see, and still giving off vertical streamers of smoke.
Beyond the pit stood the little wedge of people with the white flag at its apex, arrested by these phenomena, a little knot of small vertical black shapes upon the black ground.
Vertical black figures in twos and threes would advance, stop, watch, and advance again, spreading out as they did so in a thin irregular crescent that promised to enclose the pit in its attenuated horns.
The detachment of the plaster had left a vertical slit open in the debris, and by raising myself cautiously across a beam I was able to see out of this gap into what had been overnight a quiet suburban roadway.
From this unseen receiver a little thread of green smoke rose vertically into the quiet air.
There are no more uses of "vertical" in the book.
Show samples from other sources
The architect used long vertical lines to pull the eye upward.
On a small ladder, a good-looking sandy-haired boy is painting a vertical sign that will say: "Doc’s."
Arthur Laurents and Stephen Sondheim -- Westside Story