Gaillard's Medical Journal

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: SANITARY DEPARTMENT. Ventilation. By Justin M. Hull, M.D., Member of the State Board of Health, and Chairman of the Standing Committee on Ventilation and Heating. In reply to the query, What is to be considered the standard of purify of air in dwellings, Dr. de Chaumont says: We cannot demand ibac the air...
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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: SANITARY DEPARTMENT. Ventilation. By Justin M. Hull, M.D., Member of the State Board of Health, and Chairman of the Standing Committee on Ventilation and Heating. In reply to the query, What is to be considered the standard of purify of air in dwellings, Dr. de Chaumont says: We cannot demand ibac the air of an inhabited room shall be absolutely pure as the outside a-r. In every dwelling there will be some impurity of air. The quantity of air supplied to every inhabited room should be great enough to remove all sensible impurity, so that a person coming from the external air would perceive no trace of odor, or difference between the room and the outside air in point of freshness. Following this is the amount of pure external air which should pass through the air of a room itiated by respiration per head per hour. To answer this, Dr. de Chaumont, as the result of numerous experiments, says that per man, for each 100 cubic feet of space, 2,900 cubic feet of fresh air is required the first hour, and 3,000 cubic feet each hour thereafter. If a man is engaged in active work he should have more. If he weighs 150 pounds he should have from 4,500 to 8,600 of cubic feet of fresh air every hour. Air is also vitiated by the combustion of coal gas. Walport estimates that for every cubic foot of gas 1,800 cubic feet of air must be supplied to dilute the product of combustion. A cubic foot of coal gas will produce nearly two cubic feet of carbonic acid. A common three-foot gas- burner, burning four hours, will require 21,600 cubic feet of pure air. NATURAL VENTILATION. As to the methods of natural ventilation there are many devices. The air must be taken from a pure source. As a rule, says Parkes, the inlet tubes should be short and so construcied as to be easily cleaned, ...