Manual of hygiene for schools and colleges. Prepared by the Provincial Board of Health. Authorized by the Minister of Education for use in all schools under the control of the Education Department.

Date:
[1886]
Catalogue details

Licence: Public Domain Mark

Credit: Manual of hygiene for schools and colleges. Prepared by the Provincial Board of Health. Authorized by the Minister of Education for use in all schools under the control of the Education Department. 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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    109. Tobin’s tubes have been much praised of late years. They are fresh-air tubes carried higher than the heads of the people in the room, so as to obviate any discomfort arising from down-draughts. In rooms with windows only on one side, this is said to be a convenient method of improving the ventilation. 110. The jacketted stove, with its method of receiving pure cold air, warming it and distributing it through the room, is a most effec- tive, economical and convenient method, and may be readily introduced into houses which have been built without proper attention to the requirements of ventilation. It will be described when we come to speak of “Warming.” 111. Stallard has proposed to ventilate factories and workshops by having a double ceiling; the lower ceiling is to be made of zinc or oiled paper, perforated with very numerous small holes, and the space between the two ceilings is to be freely open to the air on all sides; thus there would be almost open air breathing, as the communication with the external air would be constant and at all parts of the room. 112. Potts has invented a system of ventilation well suited for large rooms. It consists of a hollow metal cornice running continuously around the room, and divided longitudinally throughout the whole length into two separate channels, by a plate attached to the lower one. The fresh air is admitted through openings in the walls into the lower channel, and falls imperceptibly into the room through numerous perforations. The upper channel communicates either with the smoke flue or other air shaft, and receives the vitiated air through a seiies of small openings, similar to those of the lower channel. As the fresh air, being colder, descends by its own gravity, and the vitiated air, being warmer, rises to the highest point, there is no doubt that the principles of the system are correct. Mr. Robson, architect to the London (Eng.) School Board, strongly recommends it for facility of application to buildings originally erected without proper provision for ventilation, for sightliness, economy of first cost, and self-acting pro- perties (Wilson). 113 Mr. H. Varley has proposed another plan, which has been found to work well in schools. A perforated zinc tube communicating with the external air, passes along the cornice on three sides of the room,