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Tempered or toughened glass is a type of safety glass processed by controlled thermal or chemical treatments to increase its strength compared with normal glass. Tempering puts the outer surfaces into compression and the interior into tension .
He was working with photosensitive glass and placed a piece in a furnace, planning on heating it to 600 degrees Fahrenheit. When he checked on his sample, the furnace was at 900 degrees and the glass had turned milky white. He reached into the furnace with tongs to discard the sample, and it slipped and hit the floor without shattering. [2]
The first fume hoods, constructed from wood and glass, were developed in the early 1900s as a measure to protect individuals from harmful gaseous reaction by-products. Later developments in the 1970s and 80s allowed for the construction of more efficient devices out of epoxy powder-coated steel and flame-retardant plastic laminates .
The Chambers Fireless Gas Range was a gas cook stove created by John E. Chambers in 1910, [1] [2] Two years after inventing his fireless cooker, John Chambers organized the Chambers Company in 1912. [1] Chambers' patented method of manufacture [3] used thick rock wool insulation to insulate the oven on all sides. This made it possible for the ...
For most of its history, what is now Belgium was either a part of a larger territory, such as the Carolingian Empire, or divided into a number of smaller states, prominent among them being the Duchy of Lower Lorraine, the Duchy of Brabant, the County of Flanders, the Prince-Bishopric of Liège, the County of Namur, the County of Hainaut and the County of Luxembourg.
Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.