In physics and materials science, a drop tower or drop tube is a structure used to produce a controlled period of weightlessness for an object under study. Air bags, polystyrene pellets, and magnetic or mechanical brakes are sometimes used to arrest the fall of the experimental payload. In other cases, high-speed impact with a substrate at the bottom of the tower is an intentional part of the experimental protocol.
Not all such facilities are towers - NASA Glenn's Zero Gravity Research Facility is based on a vertical shaft, extending to 510 feet (155 m) below ground level.
Read more about Drop Tube: Typical Operation, Historical Uses, List of Drop Towers
Famous quotes containing the words drop and/or tube:
“In order to cultivate yourself and to drop no lower than the level of the milieu in which you have landed, it is not enough to read Pickwick and memorize a monologue from Faust.... You need to work continually day and night, to read ceaselessly, to study, to exercise your will.... Each hour is precious.”
—Anton Pavlovich Chekhov (1860–1904)
“The last best hope of earth, two trillion dollars in debt, is spinning out of control, and all we can do is stare at a flickering cathode-ray tube as Ollie “answers” questions on TV while the press, resolutely irrelevant as ever, asks politicians if they have committed adultery. From V-J Day 1945 to this has been, my fellow countrymen, a perfect nightmare.”
—Gore Vidal (b. 1925)