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A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...
The Catherine wheel or pinwheel is a type of firework consisting either of a powder-filled spiral tube, or an angled rocket mounted with a pin through its center. When ignited, the energy of the fireworks not only create sparks and flame, but cause the wheel to quickly rotate, making the display much more spectacular.
The design for example is typical of a japanese origami folding technique for a pinwheel. [citation needed] During the nineteenth century in the United States, any wind-driven toy held aloft by a running child was characterized as a whirligig, including pinwheels. Pinwheels provided many children with numerous minutes of enjoyment and amusement ...
Pinwheel (toy), a spinning children's toy; Pinwheel (cryptography), a device for producing a short pseudo-random sequence of bits; Pinwheel (shogi), an opening in the game shogi or Japanese chess; Pinwheel (TV channel), a channel which would later turn into Nickelodeon; Pinwheel, a children's show on Nickelodeon that ran from 1977 to 1984
In his famous experiment, a cat was placed in a series of puzzle boxes in order to study the law of effect in learning. [4] He plotted to learn curves which recorded the timing for each trial. Thorndike's key observation was that learning was promoted by positive results, which was later refined and extended by B. F. Skinner's operant conditioning.
A Christmas wreath on a house door in England. A golden wreath and ring from the burial of an Odrysian Aristocrat at the Golyamata Mogila in the Yambol region of Bulgaria. Mid 4th century BC. A wreath (/ r iː θ /) is an assortment of flowers, leaves, fruits, twigs, or various materials that is constructed to form a ring shape. [1]
Pinwheel is an American children's television series that was the first show to air on the then-rebranded Nickelodeon, as well as the first to appear on its Nick Jr. block along reruns until 1990. The show was aimed at preschoolers aged 2–5. [ 1 ]
A Wartenberg wheel, also called a Wartenberg pinwheel or Wartenberg neurowheel, is a medical device for neurological use. The wheel was designed to test nerve reactions (sensitivity) as it rolled systematically across the skin. [1] A Wartenberg wheel is generally made of stainless steel with a handle of approximately 18 centimetres (7 in) in ...
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