The flywheel is held to the crank-shaft by means of a set-screw S.
The momentum of the flywheel A pushes the piston upward, closing these holes.
Nothing now remains to be made except the crank and the flywheel.
A flywheel keeps an engine going between the strokes of the piston.
Mr. Hastings helped him, but after a few turns of the flywheel there were no explosions.