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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 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]
The sprocket wheels a, b, and c engage and transport the film. a and b move with uniform velocity and c indexes each frame of the film into place for projection. Sprockets are used in the film transport mechanisms of movie projectors and movie cameras. [5] In this case, the sprocket wheels engage film perforations in the film stock.
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.
A pounce wheel, also known as a tracing wheel. Pouncing (Italian Spolvero) is an art technique used for transferring an image from one surface to another using a fine powder called pounce. It is similar to tracing, and is useful for creating copies of a sketch outline to produce finished works.
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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 ...
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.