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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 commonly 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 ...
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Most commonly, a response is evident from the circular motion or swing of a pendulum or rod or tool in a "controlled" subtle muscle reponse in conjunction with a query. Most commonly, detection is made through the subtle movement or vibrations of an apparatus, such as a Y-shaped branch, an L-shaped rod, or a pendulum.
Eccentric bottom bracket on a Burley tandem bicycle held in place with two set screws. The term is also used to refer to the device often used on tandem bicycles with timing chains, single-speed bicycles with a rear disc brake or an internal-geared hub, or any bicycle with vertical dropouts and no derailleur, to allow slight repositioning, fore and aft, of a bottom bracket to properly tension ...
Water wheel used for irrigation in Nubia, painted by David Roberts in 1838. Paddle-driven water-lifting wheels had appeared in ancient Egypt by the 4th century BCE. [25] According to John Peter Oleson, both the compartmented wheel and the hydraulic noria appeared in Egypt by the 4th century BCE, with the saqiya being invented there a century later.
A scoop wheel or scoopwheel is a pump, usually used for land drainage. A scoop wheel pump is similar in construction to a water wheel , but works in the opposite manner: a waterwheel is water-powered and used to drive machinery, a scoop wheel is engine-driven and is used to lift water from one level to another.
A water power engine includes prime movers driven by water and which may be classified under three categories: [1] Water pressure motors, having a piston and cylinder with inlet and outlet valves: their action is that analogous of a steam- or gas-engine with water as the working fluid – see water engine; Water wheels [2]