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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 was accidentally synthesized in 1872 by German chemist Eugen Baumann ...
A later substitute of a mixture of metals resembling ormolu was developed in France and called pomponne, though the mix of copper and zinc, sometimes with an addition of tin, is technically a type of brass. From the 19th century the term has been popularized to refer to gilt metal or imitation gold. [2]
The earliest gold artifacts were discovered at the site of Wadi Qana in the Levant. [13] Silver is estimated to have been discovered in Asia Minor shortly after copper and gold. [14] There is evidence that iron was known from before 5000 BC. [15] The oldest known iron objects used by humans are some beads of meteoric iron, made in Egypt in ...
Unassembled parts of a Hasegawa 1/72 F/A-18E kit. The frame surrounding the various parts is called the injection moulding "runner" or "sprue" The first plastic models were injection molded in cellulose acetate (e.g. Frog Penguin and Varney Trains), but currently most plastic models are injection-molded in polystyrene, and the parts are bonded together, usually with a plastic solvent-based ...
Bronze weapon from the Mesara Plain, Crete. Copper came into use in the Aegean area near the end of the predynastic age of Egypt about 3500 BC. The earliest known implement is a flat celt, which was found on a Neolithic house-floor in the central court of the palace of Knossos in Crete, and is regarded as an Egyptian product.
Plimpton set up Plimpton Engineering in Liverpool, England, to manufacture the components, the majority of which were made from Bakelite, a new synthetic plastic developed in the early 1900s. The sets were called "Bayko Light Construction Sets" (the term "Bayko Light" coming from the name "Bakelite") and went on sale nationally towards the end ...
It was invented in the early 18th century by Christopher Pinchbeck (died 1732), a London clock- and watch-maker. [1] Since gold was only sold in 18-carat quality at that time, the development of pinchbeck allowed ordinary people to buy gold 'effect' jewellery on a budget. The inventor allegedly made pinchbeck jewellery clearly labelled as such.
In many places brass, which is cheaper and easier to cast, was preferred to copper, so the Portuguese introduced smaller, yellow manillas made of copper and lead with traces of zinc and other metals. In Benin, Royal Art of Africa , by Armand Duchateau, is a massive manilla of 25 centimetres (9.8 in) across and 4.5 centimetres (1.8 in) gauge ...