From the loftiest point of its roof, during precisely three and a half hours of each forenoon, floats or droops, in breeze or calm, the banner of the republic; but with the thirteen stripes turned vertically, instead of horizontally, and thus indicating that a civil, and not a military, post of Uncle Sam’s government is here established.
There are no more uses of "vertical" in the book.
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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