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Arizona Road Trip Fall 2013: Arizona Plants (3)
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Cottonwood-Sedona, Arizona
Deadly Datura (Datura wrightii = D. meteloides) Solanaceae

Copper Smelting Plant At Nearby Clarkdale & Verde River

A. Slag from tailings at old copper smelting plant at Clarkdale, Arizona. Slag is technically the stony waste (matrix material) that is separated from the ore during smelting. Depending on the temperature of the furnace, it can liquefy into a scum and then reharden as it cools. Molten slag is lighter than pure copper and floats on the surface. Clarkdale was founded in 1912 as a company smelter town by William A. Clark, for his copper mine in nearby Jerome. B. Chunk of raw polished copper taken from copper mine in Michigan. Copper is a valuable metal and an excellent conductor of electricity.

Hollow Copper Cable That Once Spanned The Hoover Dam Gorge
Hoover Dam
High Voltage

A section of the original copper, overhead transmission line that carried electricity from Hoover Dam (syn. Boulder Dam) to Los Angeles. The high voltage cable is composed of ten segments to form a smooth copper tube 1.4 inches in diameter. Note the ingenious "tongue-and-groove" joints between the ten segments. This Type HH Hollow Conductor was made by General Cable during the early 1930s, and was designed to transmit 287,500 volts aross the Mojave Desert. The cable is hollow because most of the electricity flows through the outer surface (periphery). In addition, the hollow cable drastically reduced the weight burden on transmission towers.

Boyce-Thompson Arboretum
Spreading Fleabane (Erigeron divergens) Asteraceae

Watson's Pipevine (Aristolochia watsonii) Aristolochiaceae