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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.
The name hexafoil is sometimes also used to refer to a different geometric design that is used as a traditional element of Gothic architecture, [21] created by overlapping six circular arcs to form a flower-like image. [22] [23] The hexafoil design is modeled after the six petal lily, for its symbolism of purity and relation to the Trinity. [24]
The drawing represents Leonardo's conception of ideal body proportions, originally derived from Vitruvius but influenced by his own measurements, the drawings of his contemporaries, and the De pictura treatise by Leon Battista Alberti. Leonardo produced the Vitruvian Man in Milan and the work was probably passed to his student Francesco Melzi ...
the great wheel also known as walking wheel or wool wheel for rapid long draw spinning of woolen-spun yarns; the flax wheel, which is a double-drive wheel used with a distaff for spinning flax fibres for making linen; saxony and upright wheels, all-purpose treadle driven wheels used to spin both woolen and worsted-spun yarns; and; the charkha ...
Bumper cars or dodgems are the generic names for a type of flat amusement ride consisting of multiple small electrically powered cars which draw power from the floor or ceiling, and which are turned on and off remotely by an operator. They are also known as bumping cars, dodging cars and dashing cars. The first patent for them was filed in 1921.
The Saqiyah, c. 1905 'Punjab Wheel', India c.1917. A sāqiyah or saqiya (Arabic: ساقية), also spelled sakia or saqia) is a mechanical water lifting device.It is also called a Persian wheel, tablia, rehat, and in Latin tympanum. [1]
For an asymmetric wheel such as a front wheel with disc brake or a rear wheel with chain derailleur, the value of d is different for the left and right sides. a is the angle between (1) the radius to a nipple hole in the rim to which a spoke is attached, and, (2) the radius to the flange hole holding the spoke.
An early wheel made of a solid piece of wood. A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating ...