Search results
Results from the WOW.Com Content Network
These types of casts have advantages that deliver patients a better treatment than conventional casts made of plaster of Paris or Fiberglass. They are the next generation of orthopedic immobilization photo-curing specialty-resin technology that enables a waterproof, washable, lightweight, strong and comfortable way of recovering from fractures .
Still life with plaster casts, made by Daguerre in 1837, the earliest reliably dated daguerreotype [note 2] To exploit the invention, 400 shares would be on offer for 1,000 francs each; secrecy would be lifted after 100 shares had been sold, or the rights of the process could be bought for 20,000 francs.
Plaster cast bust of George Washington by Jean-Antoine Houdon based on a life mask cast in 1786.. A plaster cast is a copy made in plaster of another 3-dimensional form. The original from which the cast is taken may be a sculpture, building, a face, a pregnant belly, a fossil or other remains such as fresh or fossilised footprints – particularly in palaeontology (a track of dinosaur ...
The earliest bells were made of pottery, developing later into the casting of metal bells. [2] Archaeological evidence of bellfounding appears in Neolithic China. The earliest metal bells, with one found in the Taosi site, and four in the Erlitou site, are dated to about 2000 BCE. [1] By the 13th century BCE, bells weighing over 150 kilograms ...
India is attributed as one of the first civilizations to use casting methods to mass-produce coins. Around the middle of the first millennium BC (1000 BC – 1 BC), coins used were made from silver, but as the millennium progressed, the coins shifted to a cast copper alloy. [4] New technology was developed to mass-produce the new copper coins.
Cast iron was particularly useful to provide the entire structure of market halls, with a solid roof and open sides or highlight windows, and by the end of the 19th century nearly every new market in Europe (and most in Latin America) were cast-iron, some vast and elaborate, such as the 1850s Les Halles in Paris (demolished).
Needing a larger supply of pig iron he leased the blast furnace at Coalbrookdale in 1709. There, he made iron using coke, thus establishing the first successful business in Europe to do so. His products were all of cast iron, though his immediate successors attempted (with little commercial success) to fine this to bar iron. [104]
The first European mention of the directional compass is in Alexander Neckam's On the Natures of Things, written in Paris around 1190. [44] It was either transmitted from China or the Arabs or an independent European innovation. Dry compass were invented in the Mediterranean around 1300. [45] Astronomical compass (1269)