. Natural and artificial methods of ventilation. e.—Buildintii .Vews. XIV. Natural v. Mechanical Extraction. In a paper on Ventilation readbefore the Society of Arts, London, February ist,1893, the respective values of natural andmechanical methods of ventilation were explainedbv the lecturer, who said :— After several tests in scliools venti-lated on each system, it was clearly demonstratedthat in none of the schools examined and ventilatedmechanically by extraction—even in a new schoolopened for a week or two—was the air found tobe more pure than in those examined and ventilatednaturally wit
. Natural and artificial methods of ventilation. e.—Buildintii .Vews. XIV. Natural v. Mechanical Extraction. In a paper on Ventilation readbefore the Society of Arts, London, February ist,1893, the respective values of natural andmechanical methods of ventilation were explainedbv the lecturer, who said :— After several tests in scliools venti-lated on each system, it was clearly demonstratedthat in none of the schools examined and ventilatedmechanically by extraction—even in a new schoolopened for a week or two—was the air found tobe more pure than in those examined and ventilatednaturally without any mechanism. Draughts existed in the upper levelsof every room ventilated mechanically by extraction,while the halls of such buildings were generallyfull of draughts. According to the analysis, the numberof bacteria found in the air of the schools ventilatednaturally were about 25 per cent, less than in the airof the schools mechanicallv ventilated. NATURAL SYSTEM OF VENTILATION BV EXTRACTION ANDDIFFUSION, APPLIED TO A B CC D Roof Ventilator. Main Upcast Shaft. Branch Pipes connecting withFoul Air Exit openings inceiHtigs. Foul Air Exit opening made inceiling close to wall on oppi>-^iteside to air inlets. The freshair traversing, in an upwarddirection, the full width ofclassroom. EE FFF Inlets for fresh airscreened and washed,cooled or warmed,admitted at a lowvelocity to secure themost pet feet diffusion. Radiating Inlets forfresh air screenedand warmed, con-nected with openingsthrough external wall. Blue—Fresh air —Products of combustion ■! Brown—Products of —Products of respiration frominfected scholars. Science proves that there is not a moment of time hut when there is a movement of the air,and that this movement properly utilised is sufficient at all times to change the air in a buildingand secure ventilation. Ventilation can only be successfully accomplished at all times when it is effected withoutassis
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectventilation, bookyear
