Winston was smoking a Victory Cigarette which he held carefully horizontal.
The movement of the armies was a diagram: a black arrow tearing vertically southward, and a white arrow horizontally eastward, across the tail of the first.
When he woke, seldom before eleven hundred, with gummed-up eyelids and fiery mouth and a back that seemed to be broken, it would have been impossible even to rise from the horizontal if it had not been for the bottle and teacup placed beside the bed overnight.
There are no more uses of "horizontal" in the book.
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Paintings in which horizontal lines dominate, tend to be relaxing.
The whole thing goes horizontally, too, at least it seems so, and I exhaust myself in trying to distinguish the order of its going in that direction.