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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 ...
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 .
Inspired by the works of American scientist Joseph Henry and English scientist Michael Faraday, the circuit breaker was invented by an American, Charles Grafton Page. [79] 1837 Self-polishing cast steel plow. The plow is a tool used in farming for initial cultivation of soil in preparation for sowing seed or planting.
Parkesine, the first member of the Celluloid class of compounds and considered the first man-made plastic, is patented by Alexander Parkes. [4] 1869: John Wesley Hyatt discovers a method to simplify the production of celluloid, making industrial production possible. 1872: PVC is accidentally synthesized in 1872 by German chemist Eugen Baumann ...
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.
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).
In 1828, Bogardus invented a cotton-spinning machine called a ring flier. [4] In 1831, he invented a mechanized engraving machine that was employed for engraving dies for bank notes . He also invented the eccentric mill in 1832, which is still used in principle for fine finish of ball bearings , and, with variable eccentricity, for lens grinding .
The Hubley Manufacturing Company was first incorporated in 1894 in Lancaster, Pennsylvania by John Hubley. The first Hubley toys appeared in 1909 and were made of cast-iron, with themes that ranged from horse-drawn vehicles and different breeds of dogs, to tractors, steam shovels and guns. [1]