Rigs drilling by carpenter

The advent of cable-tool drilling introduced the wooden derrick into the changing American landscape. Using the same basic notion of chiseling a hole deeper into the earth, along with adding steam power and cl. [pdf]

Electric rock drill digging bees

The most common species of ground bee — Colletes inaequalis— is a black and tan-colored bee with a black abdomen and tan stripes. These ground nesting bees can be identified by their fuzzy tan-colored. [pdf]