. A manual of veterinary hygiene. Veterinary hygiene. '278 VETEEINAEY HYGIENE economy to put a damp proof course in the wall, and then saturate the foundation either by having no gutter or a defective one. The style of roof employed is either the ordinary closed one or the open roof. The latter may be described as a contrivance for the admission of fresh or the escape of impure air through the roof. It is usual to provide this opening along the ridge (Fig. 84), either for its full length or at intervals protected by a louvre which keeps out the rain. But the roof need not necessarily be open a
. A manual of veterinary hygiene. Veterinary hygiene. '278 VETEEINAEY HYGIENE economy to put a damp proof course in the wall, and then saturate the foundation either by having no gutter or a defective one. The style of roof employed is either the ordinary closed one or the open roof. The latter may be described as a contrivance for the admission of fresh or the escape of impure air through the roof. It is usual to provide this opening along the ridge (Fig. 84), either for its full length or at intervals protected by a louvre which keeps out the rain. But the roof need not necessarily be open at the ridge, it may open midway between the ridge and eaves as in Fig. 85, a plan largely adopted in arranging the ventila- tion of covered yards for cattle. If slates are used a good ventilating roof may be obtained by not allowing the edges to meet, the method being known. Fis. 84.—Ridge Ventilator with Louvr* Fig. 85.—Open Roof. as open slating. In the space left between the edges— which is about 2^ inches—the-air finds its way through an opening which is only the thickness of a slate, but which when spread over the whole roof represents something very considerable. Wood covered with felt or waterproof paper makes a useful light roof for small buildings, but is hardly suf- ficiently substantial for permanent ones. Though there is a prejudice against them in some quarters, galvanized iron both for walls and roof will prob- ably play an important part in the future. Buildings in galvanized iron are now made in convenient sizes for many agricultural purposes ; for stables, cow houses, or boxes for Digitized by Microsoft®. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smith, Frederick 1857-1929. New York : W. R. Jenkins
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