For centuries the issue of ballast or counter weights have been needed to make ships sail, basscule bridges operate,
cranes stay on the ground with a heavy load attached, and simply holding curtains down as they hung from the ceiling.
LEAD has been the answer in many of these cases, from its low melting temperature, to its pliability, to its weight per cubic inch. Today
still LEAD is the answer. The US Navy and Coast Guard use lead in their ships, bridges all across the world use cast lead and lead shot,
and machines need lead to counter balance.
Lead can be coated or painted to make it more safe to handle and safer for the enviroment. Think Lead the next time you need weight