Heat (A text book of physics): Eighth Edition by J. H Poynting and Sir J.J. Thomson

By J. H Poynting and Sir J.J. Thomson

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By J. H Poynting and Sir J.J. Thomson

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Additional resources for Heat (A text book of physics): Eighth Edition

Example text

Even so, a furnace was only capable of developing about 750 Pa and Buddle had to use "split ventilation" - dividing the workings into a number of parallel circuits to reduce the system resistance. 6 Earlyexampleof furnace undergroundfor ventilation of a mine unreliable. Just as mechanical ventilation was improving, a UK government select committee (1852), with that lateness of report and lack of accuracy that has always characterized politicians, stated that "any system of ventilation depending on complicated machinery is inadvisable, since under any disarrangement or fracture of its parts the ventilation is stopped, or becomes less efficient".

The more humble beginnings of building ventilation, however, started with the propeller fan which is believed to have originated in the United States. Perhaps times were hard, or the English considered gullible, for Lucius Fisher, Walter Burnham and James Morgan Blackman, all of Illinois, moved to the United Kingdom and formed the Blackman Air Propeller Ventilating Co. Ltd on 10th September 1883. A number of propeller fan designs were produced in those early years, each having completely different blades, apparently conceived on the basis of "try anything once".

The first means of providing a forced draught of air was the bellows. It is believed that bellows of a primitive type were used in Egypt for assisting the combustion of fires as far back as 400 BC. In India a simple form of bellows made from goat skins was used for iron smelting in the very early ages. The origin of the word bellows was blast-baelig - a blow bag. In the 11th century the first part of the name was dropped and in the 16th century the word baelig had become first belly, then bellies, and finally bellows.

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