Report upon the sanitary conditions of the public elementary schools of Blackburn / by Alfred Greenwood.

  • Blackburn (England)
Date:
1904
Catalogue details

Licence: In copyright

Credit: Report upon the sanitary conditions of the public elementary schools of Blackburn / by Alfred Greenwood. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    times. Open windows are nho extremely valuable in Bummer weather, whatever may be the system of ventilation. If any s}^stem of aitificial ventilation entails the provision of windows which will not open, there is always the risk that at con- siderable expense air is driven through ducts which are very dusty and difficult to clean. Certain olbservers—Cao-nelley, Haldano, Anderso-n, and Kerr,— have stated that they have proved the superiority of schools with mechanical ventilation over those which depend upon natural ventila- tion. There wag less Carbon Dioxide, and many less microbes per litre in the schools with aitificial ventilation. Also the quality of school air remained constant with mechanical ventilation, whilst it progressively became worse as the session proceeded with . natural ventilation. Moreover, better results educatioiially were obtained in mechanically-ventilated schools, and more grant earned. But. in this connection it is well to remember that the so-called naturally-ventilated schools used for purposes of comparison with schools mechanically-ventilated, may not have had the natural ventilation arranged as perfectly as possible. The question of artificial or meiohanical ventilation is also closely associated with the warming of the school. Care should be taken to prevent the air of the room from becoming too dry, and also to send in sufficient air. Regarding efficient mechanical ventilation, it. should be remembered that a wrongly-applied system may give bad results. Also, if the inlets and outlets are not placed correctly, the air may be driven through without affecting the greater volume of air in the room. A Select Committee wa.s appointed in 1902, to inquire into, the ventilation of the House of Commons. After examining eminent witnesses, they have issued a report which has recently been printed. I will quote from this report. The Committee had before them the foUomng proposals for ventilating the House: — (I.) The so-called Plenum Sy.stbm.— This consists, essientially, in keeping, by means of pressure at the intake, the air within the chamber at a constant higher pressure than the air outside; the exit being provided for simply by the difference of pressure, the aid of an exluuist power not. being called in. An essentia] fea.ture of this system
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