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- What is the origin and/or history of "percent grade" as a way to describe slope?

What is the origin and/or history of the usage of the term "percent grade" for 100 times slope in, especially but not exclusively, civil engineering?

The combinations of search terms I've tried so far only bring back the definition, examples of how to use quantities in this format, and other related practical topics.

The combinations of search terms I've tried so far only bring back the definition, examples of how to use quantities in this format, and other related practical topics.