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Posts Tagged ‘materials science

“That which does not kill us makes us stronger”*…

 

Castillo_de_San_Marcos

 

In 1702, when the Spanish still ruled Florida, an English fleet from colonial Carolina approached Castillo de San Marcos, a Spanish stronghold on the Atlantic shore.

The fort guarded the Spanish empire’s trade routes as well as the surrounding city of St. Augustine, and the English wanted to run this politically and economically important outpost for themselves. Led by Carolina’s governor James Moore, the English boats dropped their anchors and laid siege.

But even after nearly two months of being shelled with cannonballs and gunfire, the fort’s walls wouldn’t give. In fact, they appeared to be “swallowing” the British cannonballs, which then became embedded within the stone. Precisely how the walls did this remained a mystery for the next three centuries.

Normally, a cannonball creates long, deep cracks in stone that radiate out from the impact’s center, causing catastrophic damage to a structure. This was clearly not the case for the walls surrounding Castillo de San Marcos. Built from coquina—sedimentary rock formed from compressed shells of dead marine organisms—the walls suffered little damage from the British onslaught. As one Englishman described it, the rock “will not splinter but will give way to cannon ball as though you would stick a knife into cheese.”…

The secret of the Spanish– and what it might mean for the future: “The Mystery of Florida’s Cannonball-Eating Spanish Fort.”

* Friedrich Nietzsche

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As we muse on mutable materials, we might send altitudinous birthday greetings to Ferdinand Adolf Heinrich August Graf von Zeppelin; he was born on this date in 1838.  An inventor, engineer, and manufacturer, he was the aviation pioneer who built the first rigid dirigible airships– called, in his honor, Zeppelins.

He patented his idea in 1895, then formed a company to build airships in 1898–  though many thought his invention incredible, and dubbed him “Foolish Count.”  His first airship took off on July 2, 1900; its success stimulated funding.  Eventually, he produced more than 100 dirigibles for military uses in World War I, during which, the Zeppelins were used to bomb Britain.  After the war, he continued to improve the design and built a fleet of airships for commercial passenger service, which included transatlantic flights.  Zeppelin use ended after the May 6, 1937 Hindenburg fire disaster at Lakehurst, N.J.

220px-Bildnis_Ferdinand_von_Zeppelin source

 

Written by LW

July 8, 2019 at 1:01 am

“Any color– so long as it is black”*…

 

A British company has produced a “strange, alien” material so black that it absorbs all but 0.035 per cent of visual light, setting a new world record. To stare at the “super black” coating made of carbon nanotubes – each 10,000 times thinner than a human hair – is an odd experience. It is so dark that the human eye cannot understand what it is seeing. Shapes and contours are lost, leaving nothing but an apparent abyss.

If it was used to make one of Chanel’s little black dresses, the wearer’s head and limbs might appear to float incorporeally around a dress-shaped hole.

Actual applications are more serious, enabling astronomical cameras, telescopes and infrared scanning systems to function more effectively. Then there are the military uses that the material’s maker, Surrey NanoSystems, is not allowed to discuss.

The nanotube material, named Vantablack, has been grown on sheets of aluminum foil by the Newhaven-based company. While the sheets may be crumpled into miniature hills and valleys, this landscape disappears on areas covered by it [as seen in the photo above]…

Read more about the new material– “pretty much as black as we can get, almost as close to a black hole as we could imagine”– in “Blackest is the new black: Scientists have developed a material so dark that you can’t see it.”

* Henry Ford, describing the choices in purchasing a Model T

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As we reach for our torches, we might recall that it was on this date in 622 that the Islamic prophet Muhammad, who’d been warned of a pending assassination attempt, and his followers began their migration from Mecca to Medina– an event known as “Hijra” (Arabic: هِجْرَة‎ hijrah, or Hijrat or Hegira).  The Hijra was later declared the beginning of the Muslim calendar, so that any subsequent date is known. a la “AD” or “CE,” as “AH” (Anno Hijra).

 source

 

Written by LW

July 16, 2014 at 1:01 am

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