Domestic economy : comprising the laws of health in their application to home life and work / by Arthur Newsholme and Margaret Eleanor Scott.

  • Newsholme, Arthur, Sir, 1857-1943.
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: Domestic economy : comprising the laws of health in their application to home life and work / by Arthur Newsholme and Margaret Eleanor Scott. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

    156/363 (page 140)
    Assuming that air enters a room at the rate of 6 feet per second (half the average velocity of the wind in this country), then in one hour 3,000 cubic feet of air would enter through an aperture measuring 24 square inches ; and this is the usual allowance for inlet and outlet open- ings for each individual, making 48 square inches alto- gether. It should be noted that a number of small openings are collectively not as efficient for ventilating purposes as one large opening having the same area, owing to the increased friction in the former case. Position of Inlet and Outlet.—The best position theo- retically for inlets of fresh air is the floor, but this leads to cold currents along the floor of an unpleasant character. It is advisable, therefore, to admit air along the wall a little more than six feet from the floor, the current of air being directed upwards by some contrivance. The stair- case in most houses forms an important inlet for fresh air. The staircase window may be kept open when an open window in the dining-room could not be tolerated. The staircase should be cut off from air communication with the basement of the house, and care should be taken that the window of the water-closet is not the only open window in the house, or the ventilation of the house will be derived from this source. Outlets are generally best placed near the ceiling of a room, and should as far as possible be enclosed within walls. The escape of impure air is greatly helped by keeping it as warm as possible, and as warm impure gases from the combustion of gas and from human respiration tend to hang about the ceiling, this is the most economical point of outlet.