Mankind has measured distances for centuries. Before the steel tapes we have today, chains and links were used as measuring devices for distance. What is the standard length of a measuring chain? And that of a link?
A 'rod' or 'pole' was also a standard length of measurement.
A "link" is 7.92 inches, and a "chain" is 66 feet. If 25 "links" are used for measuring, that would be 16.5 feet, the length of a "rod". By coincidence, that 66 feet equals 792 inches, so 100 links would make a "chain" length.
https://en.wikipedia.org/wiki/Gunter's_chain Surveyors had to be a robust type, working with that weighty chain all day!!
F@H.. to solve mankind's maladies.. in our lifetimes!