Many of Iron Wharf visitors are competent sailors, with a huge wealth of knowledge. And phrases are used with the assumption we all know what they mean!
Two such phrases are Knots and Nautical Miles.
1 Nautical mile per hour is the equipment to 1 knot. Strickly speaking 1 knot = 1.15 miles.
In the 17th Century there was still a need to measure speed, and sailors used 'a common log' to do this.
A common log was a length of rope with a piece of triangular wood attached the one end and knots tied along the length at uniform intervals.
The line was thrown overboard, and allowed to pay out from a coil, on its own. After a set amount of time the line was hauled in and the number of knots that had payed out was counted. This gave the speed of the vessel, ie. 20 knots.
Iron Wharf Boatyard
Iron Wharf Boatyard in Faversham, Kent provides storage, containers, DIY yard, and many other services.