18th century sailcraft… and attention to detail…
There is a lanyard sewn into the edges of the sail, and another then sewn into the corner of the sail to hold the metal eye in place for the attached lanyard to connect to either the cross piece, or run down to the winch or lower cross piece depending on the specific sail.
The level of detail above, might seem to be more ‘artistic’, but is, in fact, necessary to keep the sail from ripping the lanyard out under stress. Depending on the size of the sail, and its use, it could have a dry weight of up to a TON, and take more tons of pressure to move a large ship!!!
Sailmaking was a mix of art and science, and many of the ships of the line had crews of sailmakers as part of the crew. Article HERE.