Monkey’s Fist info via Wikipedia
The monkey’s fist knot is most often used as the weight in a heaving line. The line would have the monkey’s fist on one end, an eye splice or bowline on the other, with about 30 feet (~10 meters) of line between. A lightweight feeder line would be tied to the bowline, then the weighted monkey’s fist could be hurled between ship and dock (or vice versa). The other end of the lightweight line would be attached to a heaver-weight line, allowing it to be drawn to the target easily.
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har har
I knew you would approve
Another method of transfer was the use of the Costin gun to send a messenger across, particularly in rough seas when it was prudent to maintain a greater distance between vessels.