The electromagnets were assembled by wrapping anodized copper wiring around plastic spools which were mounted linearly along a board, set horizontally beneath the track.
(The electromagnets; were assembled; by wrapping anodized copper wiring around plastic spools) (plastic spools; were mounted; L:linearly; L:along a board) (a board; set; horizontally; L:beneath the track)
The electromagnets plastic spools a board
were assembled were mounted set
by wrapping anodized copper wiring around plastic spools
L:linearly L:along a board
horizontally L:beneath the track