Cum ergo cccc versationibus imi tympani semel superius versabitur, progressus efficiet spatia pedum milia quinque, id est passus mille.
Since, therefore, in 400 revolutions of the lower drum, the upper drum will revolve once, as it moves it will record thereby a distance of 5000 feet, that is, of 1000 paces.
final_alignments\Vitruvius_Architecture_Book_10.json