…with rocks bars and rocks. (grip hoist and excavators not available)
When did the advantage of using a lever first become apparent? Was the knowledge handed down by word, until finally written? I’m not sure, but rock bars are a staple tool for leveraging advantage for trail work in rocky areas. As shown in the image below, the ratio of the load arm to effort arm determines advantage, the most advantage being achieved from using the shortest load arm length practicable.
One of the harder tasks encountered in trail building is getting rocks, or better yet “boulders,” out of holes. Sometimes a rock has to be (re)moved or harvested for use elsewhere.
It’s a hard task made simple, but maybe not easy:
Start replacing the boulder’s home/hole with small rocks to slowly pry and jack it out of its home– replacing is home with small rocks…trading places. The small rocks are used as fulcrums to help lift the rock, adding more as the rock is lifted until its ejected.