BILDAGENTUR-ONLINE / OHDE / SCIENCE PHOTO LIBRARY BILDAGENTUR-ONLINE / OHDE / SCIENCE PHOTO LIBRARY
Oil pump. This is a 'nodding donkey', a type of pump used where there is not enough natural pressure to force oil out of a well by itself. Photographed at Allermoehe, near Hamburg, Germany.
Model release not available. Property release not available.