What a great video! And such beautiful boats! I have so many questions. What design were they? Were the umbrella tied to topping lifts? I suspect this was filmed somewhere in North America - where were you? Such a beautiful part of the world! Thanks so much for putting this together.
In last slide from left to right: A Bill Garden Tom Cat, Coquina, Sooty Tern (my boat), Marsh Cat and Ilur. On my boat I hang the umbrella from the halyard and position with line from handle. Works quite well. Maryland, USA. Thanks!