34.5 MB (34.0 MB compressed)
4256 x 2832 pixels
36.1 x 23.9 cm ⏐ 14.2 x 9.4 in (300dpi)
SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Oil. Jack pumps used for oil extraction. These pumps, also known as 'nodding donkeys', are used where the natural pressure in the oil well is too low to force oil out at an economic rate. The pump uses a series of non return valves to draw the oil out as the head nods up and down. Such pumps are now becoming less frequently used as new recovery techniques are developed. Photographed in the Khanty-Mansi district of Russia.
Model release not required. Property release not available.