Experiments upon this subject are not difficult.
He had just constructed a boat that could be propelled by a kite with the wind in its favor, and one day he tried experiments to see if he could steer the kite against the wind.
Did my crazy husband's experiments keep you up all night?
Quinn could poke around with his experiments on his own time as he'd done all summer.
Gerdien has more recently repeated the experiments, employing an apparatus devised by him for the purpose.