Poultry culture sanitation and hygiene . me. Thus, through such aventilation in a space of 1000 cubic feet +he carbon dioxidcontent of the air may be reduced from per thousand to thousand. The objection to using wind as a ventilatingagent is that the velocity may mean a draft. In supplying heat to brooders and in their ventilating prob-lems the fact that heated air becomes light and rises must bekept in mind, thus the monitor and half monitor houses fur- 172 POULTRY CULTTJEE nish ideal conditions for the escape of the hght vitiated airarising from the birds, while the cooler outside
Poultry culture sanitation and hygiene . me. Thus, through such aventilation in a space of 1000 cubic feet +he carbon dioxidcontent of the air may be reduced from per thousand to thousand. The objection to using wind as a ventilatingagent is that the velocity may mean a draft. In supplying heat to brooders and in their ventilating prob-lems the fact that heated air becomes light and rises must bekept in mind, thus the monitor and half monitor houses fur- 172 POULTRY CULTTJEE nish ideal conditions for the escape of the hght vitiated airarising from the birds, while the cooler outside air comes in ata lower level, causing an upward current, relieving the buildingof polluted air by the process of diffusion and air currents. Air shafts or tubes may be used, and can be used as eitherinlets from the sides or outlets from the top or roof. Airpassing along a tube suffers loss from friction; thus, air movingthrough a tube at a velocity of 8 feet per second would bereduced to 4 feet per second on striking a right angle. The. Fig. 63.—Methods of hanging doors. 1, The upper half swings out;2, the door swings botli ways on a two-way hinge; 3, each half swings out;4, the door swings out; 5, the door slides to one side on a track. smaller the tube, the greater the friction and the greater inter-ference with the velocity per volume of air. Tubes should bemade with rounded or U-shaped curves instead of abruptstraight right angles. One foot square will admit 15,000 cubic feet of air per hourwith a calm air; that is, with the velocity of 3 miles per air, that is, 8 miles per hour velocity, square footwill admit 15,000 cubic feet of air per hour. A light breeze,or 13 miles an hour, square feet will admit 15,000 cubicfeet of air per hour. CHAPTER VITHE CONSTRUCTION OF POULTRY HOUSES Some of the essential features is the economic constructionof the houses, to provide sufficient room, proper ventilation,proper equipment, and durability. As a rule, the old f
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpoultry, bookyear1921
