He therefore hit on the ingenious idea of timing them as they rolled down planes inclined at different angles.
(He; hit; on the ingenious idea of timing them; T:as they rolled down planes) (they; rolled; down; planes inclined at different angles) (planes; inclined; L:at different angles)
He they planes
hit rolled inclined
on the ingenious idea of timing them T:as they rolled down planes
down planes inclined at different angles
L:at different angles