Furlongs on the milestone

 

I was interested by the distance to Capel Curig from Bangor: 14M 3F means 14 miles and 3 furlongs. I have never seen furlongs used like this before. I had to look up a furlong - apparently from "furrow length" and thus how far a team of oxen could plough without resting. There are 8 furlongs in a mile so Capel Curig is just under 14 and a half miles away.