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Early designs of perpetual motion machines were done by Indian mathematician–astronomer Bhaskara II, who described a wheel (Bhāskara's wheel) that he claimed would run forever. [2] A drawing of a perpetual motion machine appeared in the sketchbook of Villard de Honnecourt, a 13th-century French master mason and architect.
The name zoetrope was composed from the Greek root words ζωή zoe, "life" and τρόπος tropos, "turning" as a translation of "wheel of life". The term soetrope was coined by inventor William E. Lincoln. [1]
Most lotteries use mechanical lottery machines. These are more interesting to watch, and more transparent, both literally and figuratively: the audience can see exactly how the internal workings of the machine operate, and they can watch the balls come out of the machine; generally, the balls are visible during the entire draw.
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A wheel power divided by the initial jet power, is the turbine efficiency, η = 4u(V i − u)/V i 2. It is zero for u = 0 and for u = V i. As the equations indicate, when a real Pelton wheel is working close to maximum efficiency, the fluid flows off the wheel with very little residual velocity. [11]
A water wheel is a machine for converting the kinetic energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a large wheel (usually constructed from wood or metal), with numerous blades or buckets attached to the outer rim forming the drive mechanism. Water wheels were still in commercial ...
The New Zealand Cabinet approved the creation of Lotto in February 1986, the necessary legislation passing through Parliament in April that year with a 47–20 vote. The New Zealand Lotteries Commission was established in June 1987 and the existing Golden Kiwi lottery came under its authority.
Spirograph is a geometric drawing device that produces mathematical roulette curves of the variety technically known as hypotrochoids and epitrochoids.The well-known toy version was developed by British engineer Denys Fisher and first sold in 1965.