Learning about flotation–if the barge is made of steel how can it float? The simplest things capture the imagination and phones and I pads put aside. Loading barges (sardine tins) with heavy cargo(old pennies). How many before it sinks?!
General view with our chairman Barry teaching a few magic trick with rope.
How did we lift sails and cargo on sailing ships before we had engines and cranes?
How did you do that?