one of a number of chains attached to a hull about to be launched in restricted waters in order to slow its motion by dragging along the bottom.
The chopped hay is then moved by conveyor or drag chain to animal feed stations.
Fuel is fed to each boiler by a drag chain with adjustable feed, a rotary seal valve.
Grit is conveyed from the wet well to the pond utilizing a drag chain and auger.
Bottom ash was discharged from the grates to a wet quench tank and removed with a drag chain.