TAILIEUCHUNG - An Encyclopedia of the History of Technology part 97

An Encyclopedia of the History of Technology part 97. This one of a kind encyclopedia presents the entire field of technology from rudimentary agricultural tools to communication satellites in this first of its kind reference source. Following an introduction that discusses basic tools, devices, and mechanisms, the chapters are grouped into five parts that provide detailed information on materials, power and engineering, transportation, communication and calculation, and technology and society, revealing how different technologies have together evolved to produce enormous changes in the course of history | PART FIVE TECHNOLOGY AND SOCIETY economical easy to use and needing a minimum of attention it was made of cast iron and enclosed in an enamelled insulated jacket Dalen used kieselguhr a diatomaceous earth as insulating material. The heat was conducted to the various parts at precisely the correct temperature for the types of cooking needed boiling baking grilling etc. The temperature of the hob plates was maintained by the fitting of insulated hinged covers which were retained in place when the plates were not in use. The Aga was introduced in Britain in 1929. It is still in use today but the modern version is thermostatically controlled and can function on solid fuel gas or oil. Cooking by gas In the early nineteenth century as the supply of gas was extended see Chapter 3 experiments took place to try to use the fuel for cooking but the problems of making it financially viable were formidable. The cost of gas was much greater than coal there were no meters so there was difficulty in measuring consumption more important still the public were prejudiced against the use of gas believing it to be dangerously explosive and the fumes and impurities in the gas to be harmful to any food cooked by it. Despite these problems inventors continued to try to make satisfactory appliances. One of the early workable devices was a griller of 1824 made at the Aetna Ironworks near Liverpool. It was a kind of gridiron made from a gun-barrel with holes pierced in it then twisted round to a circular shape. It could be used horizontally with pans placed on top or vertically so that a joint could be roasted in front. Commercial box-shaped cookers were marketed from the 1830s and in 1847 read a paper to the Royal Society of Arts in London on the Domestic Uses of Gas . In this he referred to Alexis Soyer the famous French chef who took the lead in promoting cooking by gas because he believed it to be clean efficient and economical in comparison with coal he had introduced it into

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