Inventos

Páginas: 2 (351 palabras) Publicado: 13 de noviembre de 2012
Under the rules of golf, a golf ball weighs no more than 1.620 oz (45.93 grams), has a diameter not less than 1.680 in (42.67 mm), and performs within specified velocity, distance, and symmetrylimits. Like golf clubs, golf balls are subject to testing and approval by the Royal and Ancient Golf Club of St Andrews and the United States Golf Association, and those that do not conform withregulations may not be used in competitions

A trigger is a mechanism that actuates the firing sequence of a firearm. Triggers almost universally consist of levers or buttons actuated by the index finger.Some variations use the thumb or weak fingers to actuate the trigger, a feature typically found on mounted weapons. Examples are the M2 Browning machine gun and the Springfield Armory M6 Scout.

Oilpainting is the process of painting with pigments that are bound with a medium of drying oil—especially in early modern Europe, linseed oil. Often an oil, such as linseed, was boiled with a resin, suchas pine resin or even frankincense; these were called 'varnishes' and were prized for their body and gloss. Other oils occasionally used include poppyseed oil, walnut oil, and safflower oil. Theseoils confer various properties to the oil paint, such as less yellowing or different drying times. Certain differences are also visible in the sheen of the paints depending on the oil. Painters oftenuse different oils in the same painting depending on specific pigments and effects desired. The paints themselves also develop a particular consistency depending on the medium.

The earliest datedprinted book known is the "Diamond Sutra", printed in China in 868 CE. However, it is suspected that book printing may have occurred long before this date.
Before Gutenberg, printing was limited in thenumber of editions made and nearly exclusively decorative, used for pictures and designs. The material to be printed was carved into wood, stone, and metal, rolled with ink or paint and transferred...
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