The ski boards appear to be rectangular, maybe 3 to 4 feet wide by 6 to 7 feet long. It is approximately 4 inches thick. The front of it is a knife-edge, the bevel is about a foot wide. The top of the board is flat, allowing two people to easily ride it. The tow rope is connected directly to the board, with another rope for holding onto. They are towing closer than we do today. (Big surprise.)
It’s a good thing these people are gone now. Marine Patrol would be trying to track them down! It is clear to see why a safe distance law was instituted, many of the boats came within ten feet of the people being towed.
The races at The Weirs look exceptionally dangerous too. 25’ (plus or minus) boats are racing around in a circle, very close together. Crazy! It does look like they are having fun though.