A device for measuring certain properties of hemp rope, tarred or otherwise?
https://en.wikipedia.org/wiki/Manila_rope
https://en.wikipedia.org/wiki/Tarring_(rope)
Edit:
Here it is (rope gauge):
http://www.mathsinstruments.me.uk/page94.html
"No friend ever served me, and no enemy ever wronged me, whom I have not repaid in full."
Lucius Cornelius Sulla - died 78 BC
Cheers Craig