Cylinders should be stowed fore-and-aft on athwartships
dunnage. Where practicable, the stow should be secured by using two
or more wires, laid athwartships prior to loading, and passed around
the stow to securing points on opposite sides. The wires are tightened
to make a compact stow by using appropriate tightening devices. During
loading, wedges may be necessary to prevent cylinders rolling.