Manual percussive drilling was used for drilling at more substantial depths, and especially for advancing the bore hole through harder rocks than it was possible to reach by hand digging. Hand digging placed workers at the bottom of the well with shovels, pickaxes and buckets and it was very risky to dig over 250-330 feet (80-100 meters) because of the risk of structural failures, heat, and lack
... [Show full abstract] of oxygen. In the United States, early percussion drilling for salt brine deposits mixed with petroleum are recorded at the beginning of the 19th century. Excavations were propelled by a man kicking into a rope loop or jumping on a spring-loaded platform.