A Rudimentary Treatise On Warming And Ventilation Being a Concise Exposition of
The book A Rudimentary Treatise On Warming And Ventilation Being a Concise Exposition of was written by author Charles Tomlinson Here you can read free online of A Rudimentary Treatise On Warming And Ventilation Being a Concise Exposition of book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Rudimentary Treatise On Warming And Ventilation Being a Concise Exposition of a good or bad book?
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This contrivance acts on a similar principle to the wind-sail used on board ships, which consists of a sail spread out to the wind : from the lower part proceeds a cylinder of canvas dis- tended by hoops, which maybe carried down through the hatches, to any deck or hold where fresh air is required. Its action depends on the force of the wind, and the mode of arranging it : it is of no use in calm weather, when ventilation is often most needed : and it is equally unavailable in stormy weather, T...HE WIND-SAIL AND THE FAN. 181 when the hatches are battened down, and the mencrowded below. Indeed, unless some contrivance could be made for getting rid of the vitiated air by other openings, the supply of fresh air by the wind-sail must always be partial and defective. The next class of mechanical contrivances for ventilation, is that in which the aid of an attendant is required, either to maintain the ventilating machine in motion, or to superintend the mechanical power that does so. The simplest of these contrivances is the fan, which has been used from time imme- morial, especially in warm climates, where it is often made of an enormous size, and being wielded by an attendant with the dexterity acquired by long practice, its effect is very power- ful in giving motion to the air, and producing the sensation of coolness, by bringing a larger supply to the person, and abstracting the heat by its motion.
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