Photograph of a man checking the oil level in an oil storage tank, [s.d.]. The middle-aged man can be seen standing at the top of an oil storage tank, holding a long chain attached to a large metal weight. He can be seen holding the device over an opening in the tank, presumably preparing to drop the weight into the opening, in order to check the level of oil inside the tank. The area surrounding the opening appears to be stained with oil. To the man's right, a ladder can be seen, and two other oil tanks can be seen in the background.