It contained 4,200 tons of metal, the axle alone weighed 70 tons, and this mass was formed into what may be called a bicycle wheel with tension spokes.
(It; contained; 4,200 tons of metal) (the axle; alone weighed; 70 tons) (this mass; was formed; into what may be called a bicycle wheel with tension spokes)
It the axle this mass
contained alone weighed was formed
4,200 tons of metal
70 tons
into what may be called a bicycle wheel with tension spokes