...and me and Silas and my Sid and Tom on the constant watch day AND night, as I was a-telling you, and not a one of us could catch hide nor hair nor sight nor sound of them; and here at the last minute, lo and behold you, they slides right in under our noses and fools us, and...
We didn’t have no trouble about snags; the lightning was glaring and flittering around so constant that we could see them plenty soon enough to throw her head this way or that and miss them.
There are no more uses of "constant" in the book.
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The history of computers is a history of constant technological advancement.