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A Y-shaped twig or rod, or two L-shaped ones, called dowsing rods or divining rods are normally used, and the motion of these are said to reveal the location of the target material. The motion of such dowsing devices is generally attributed to random movement, or to the ideomotor phenomenon , [ 7 ] [ 8 ] [ 9 ] a psychological response where a ...
It was alleged by Kenneth Roberts who wrote the book Henry Gross and His Dowsing Rod (1951) that Gross located water all over Maine and in surrounding states. [1] [2] Science writer Martin Gardner disputed any occult interpretation of Gross's abilities commenting that his dowsing was the result of the exaggeration, ideomotor effect and random ...
The first type of screw conveyor was the Archimedes' screw, used since ancient times to pump irrigation water. [1] They usually consist of a trough or tube containing either a spiral blade coiled around a shaft, driven at one end and held at the other, or a "shaftless spiral", driven at one end and free at the other. The rate of volume transfer ...
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The screw pump is the oldest positive displacement pump. [1] The first records of a water screw, or screw pump, date back to Hellenistic Egypt before the 3rd century BC. [1] [3] The Egyptian screw, used to lift water from the Nile, was composed of tubes wound round a cylinder; as the entire unit rotates, water is lifted within the spiral tube to the higher elevation.
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Divining rod, two rods believed by some to find water in a practice known as dowsing; Fishing rod, a tool used to catch fish, like a long pole with a hook on the end; Lightning rod, a conductor on top of a building to protect the building in the event of lightning by taking the charge harmlessly to earth; Measuring rod, a kind of ruler
A threaded rod, also known as a stud, is a relatively long rod that is threaded on both ends; the thread may extend along the complete length of the rod. [1] They are designed to be used in tension. [2] Threaded rod in bar stock form is often called all-thread (ATR); other names include fully-threaded rod, redi-rod, continuously-threaded rod ...