These giants used a clamshell bucket and counterweight system to scoop the cargo out of the holds, one load at a time.

There are several available methods but most tend to employ a counterweight system or a hauling system.

In a conventional counterweight system the operating and lift lines terminate at the top of the arbor after passing over the head block.

Rope locks are cam-actuated devices through which a counterweight system operating line passes.

To address this issue compensating chains may be built into the counterweight system.

When loading a batten, or arbor in a counterweight system, it is imperative to control the balance of a set.

There are elaborate types with counterweight systems that are designed to block squirrels or even heavy birds, like pigeons.

"Nice counterweight system you've installed, sir," the chief engineer said.

There may never have been an elaborate counterweight system, at least not exactly as he envisions it.

His key innovation was a counterweight system that raised the gun as well as controlled the recoil.