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The Pantheon in Rome is an example of Roman concrete construction. Caesarea harbour: an example of underwater Roman concrete technology on a large scale. Roman concrete, also called opus caementicium, was used in construction in ancient Rome. Like its modern equivalent, Roman concrete was based on a hydraulic-setting cement added to an aggregate.
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The major confusion involved for many people in this subject is the terminology used. Roman cement was originally the name given, by Parker, to the cement he patented which is a natural cement (i.e. it is a marl, or limestone containing integral clay, dug out of the ground, burnt and ground to a fine powder). [2] [5]
Calcium is a binding agent in Roman concrete, which makes it remarkably strong. Figuring out where it came from was the key to solving this architectural mystery.
Pont du Gard (1st century AD), over the Gardon in southern France, is one of the masterpieces of Roman technology.. Ancient Roman technology is the collection of techniques, skills, methods, processes, and engineering practices which supported Roman civilization and made possible the expansion of the economy and military of ancient Rome (753 BC – 476 AD).
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With this knowledge, over the next few years, Flamel and his wife allegedly decoded enough of the book to successfully replicate its recipe for the philosopher's stone, producing first silver in 1382 and then gold. Also, Flamel is said to have studied some texts in Hebrew. The validity of this story was first questioned in 1761 by Etienne Villain.
Alchemy was a series of practices that combined philosophical, magical, and chemical experimentation. One goal of European alchemists was to create what was known as the Philosopher’s Stone , a substance that when heated and combined with a non precious metal like copper or iron (known as the “base”) would turn into gold.