Originally this was with a mortar-and-pestle or a similarly operating stamping-mill, using copper, bronze or other non-sparking materials, until supplanted by the rotating ball mill principle with non-sparking bronze or lead.

An example of transient conduction which does not end with steady-state conduction, but rather no conduction, occurs when a hot copper ball is dropped into oil at a low temperature.

A BB is a small ball, typically made of steel with a copper or zinc plating, of 4. 5 mm /. 177 " diameter.

The ball was ingeniously made of sheets of copper soldered together and hammered into shape and then gilded.

The conical roof was crowned with a gilt copper ball and cross, containing holy relics, by Verrocchio in 1469.

The building of the cathedral had started in 1296 with the design of Arnolfo di Cambio and was completed in 1469 with the placing of Verrochio's copper ball atop the lantern.

The combined heat, pressure, and ultrasonic energy create a weld between the copper or gold ball and the surface of the chip-which is usually copper or aluminum.

Today, the ball end of the hammer is used to cut gaskets, expand and shape the free end of copper roves, light rivets, and " set " rivets ( which completes the joint ).

The arms and legs were constructed of flexible copper tubing with ball bearing joints at knee and elbow, while the helmet had four windows of shatterproof glass and was equipped with a telephone.

: The first struck the copper Libulan and melted him into a ball.

A little man with a `` a dark copper color '' skin, he was wearing `` calico trousers and a white cotton short gown ''.

A set of tables containing spectral intensities for 39,000 lines of 70 elements, as observed in a copper matrix in a d-c arc, was completed and published.

Together they also developed a new form of voltaic cell in which the wooden trough was replaced by one of copper, thereby producing stronger currents.

The gruesome humor of the Nazis was not forgotten -- the gas chamber with a sign on it with the name of a Jewish foundation and bearing a copper Star of David -- nor the gratuitous sadism of SS officers.

Bronze, an alloy of copper and tin, was the first alloy discovered, during the prehistoric period now known as the bronze age ; it was harder than pure copper and originally used to make tools and weapons, but was later superseded by metals and alloys with better properties.

Native copper, however, was found worldwide, along with silver, gold and platinum, which were also used to make tools, jewelry, and other objects since Neolithic times.

In ancient Egypt and Mycenae, gold was often alloyed with copper to produce red-gold, or iron to produce a bright burgundy-gold.

The spread of the Akkadian state as far as the " silver mountain " ( possibly the Taurus Mountains ), the " cedars " of Lebanon, and the copper deposits of Magan, was largely motivated by the goal of securing control over these imports.

The wealth of Amathus was derived partly from its grain partly from its sheep and copper mines, of which traces can be seen inland.

"... Turquoise was chosen because the greenish-blue stone is indigenous to Arizona, copper because Arizona is one the nation's top copper-producing states and purple because it has become a favorite color for Arizona sports fans, thanks to the success of the National Basketball Association's Phoenix Suns.

While some fans applauded the redesign, most of the reaction to the new color scheme, which included the changing of the historical purple and traditional Arizonan colors of copper and turquoise to a reddish color known as " Sedona Red " similar to that of the Phoenix Coyotes and Arizona Cardinals color schemes, was pointedly negative.

Naturally, many people assumed the color was due to copper because copper compounds often have blue and green colors.

By working with Motorola, AMD was able to refine copper interconnect manufacturing to the production stage about one year before Intel.

AMD's new fab in Dresden came online, allowing further production increases, and the process technology was improved by a switch to copper interconnects.

Extensive structural membrane damage to bacteria was noted after being exposed to copper.

Although forms of brass have been in use since prehistory, its true nature as a copper-zinc alloy was not understood until the post medieval period because the zinc vapor which reacted with copper to make brass was not recognised as a metal.

By the Roman period brass was being deliberately produced from metallic copper and zinc minerals using the cementation process and variations on this method continued until the mid 19th century.

It was eventually replaced by speltering, the direct alloying of copper and zinc metal which was introduced to Europe in the 16th century.

Unlike steel, bronze struck against a hard surface will not generate sparks, so it ( along with beryllium copper ) is used to make hammers, mallets, wrenches and other durable tools to be used in explosive atmospheres or in the presence of flammable vapors.

The new system consisted of five coins: the aureus / solidus, a gold coin weighing, like its predecessors, one-sixtieth of a pound ; the argenteus, a coin weighing one ninety-sixth of a pound and containing ninety-five percent pure silver ; the follis, sometimes referred to as the laureatus A, which is a copper coin with added silver struck at the rate of thirty-two to the pound ; the radiatus, a small copper coin struck at the rate of 108 to the pound, with no added silver ; and a coin known today as the laureatus B, a smaller copper coin struck at the rate of 192 to the pound.

* Following coinage reform, the as was struck in reddish pure copper, instead of bronze.

The first unauthorized coins minted in the American colonies, and the first in Connecticut, were struck by Dr. Samuel Higley in 1737 from copper mined from his own mine.

The first unauthorized coins minted in the American colonies, and the first in Connecticut, were struck by Dr. Samuel Higley in 1737 from copper mined from his own mine.

The percussion-cap system replaced the flintlock's flint and flashpan with a waterproof copper cap that created a spark when struck.

The 1943 steel cent, also known as a steel war penny or steelie, was a variety of the U. S. one-cent coin which was struck in steel due to wartime shortages of copper.

It is because of this that the 1827 copper penny is extremely rare in mint state with only 2 known worldwide despite nearly 1. 5 million struck.

Just three portraits of the Queen were used on the penny in the whole of her reign, the Young Head ( used from 1838 to 1859, with rare copper issues from 1860-the 60 is struck over 59 ), designed by William Wyon ( who died in 1851 ), whose eldest son Leonard Charles Wyon ( 1826 – 91 ) designed the bronze coinage of 1860 with the second (" bun ") head ( 1860-1894 with scarce issues of the farthing in 1895 ), and finally the Old Head ( or " veiled head ") designed by Thomas Brock which was used on the penny from 1895 to 1901.

Current sovereigns are struck in the same 22 carat ( 91⅔ %) Crown gold ( 11 / 12 gold and 1 / 12 copper ) alloy as the first modern sovereigns of 1817.

Some of these were struck in copper, indicating that the 1792 dismes were in fact pattern coins.

Many were struck in copper, although silver and gold were also used.

If the coin was sufficiently heated and struck hard enough, a layer of eutectic alloy ( a mixture of 72 % silver and 28 % copper that has the lowest melting point of any mixture of these two metals ) would be produced, fusing the layers together.

In peripheral regions, even cruder counterfeits might pass: in the Viking-age site in Coppergate, Coppergate, York, a forgery of an Arab dirham was found, struck as if for Isma ' il ibn Achmad ( ruling at Samarkand, 903-07 / 8 ), of copper covered by a once-silvery wash of tin.

The Birmingham Mint won its first contract to strike finished coins for Britain – 500 tons of copper, struck between August 1853 and August 1855, with another contract to follow in 1856.

Between 1896 and 1898 the Mint struck all of Russia's copper coins ( over 110, 000, 000 coins per year ).