Practical talks on farm engineering : A simple explanation of many everyday problems in farm engineering and farm mechanics written in a readable style for the practical farmer . as beenfound well to lay a coating of tar or asphalt onthe foundation walls and on this put the sills,thus making an air-tight job. There must beno entrance of air underneath the ice. It istrue that a small amount will enter through thedrain if the latter is not trapped, but this is notsufficient to do any harm. In a commercialhouse of large size, however, the drain should beof tile and trapped as it comes from under
Practical talks on farm engineering : A simple explanation of many everyday problems in farm engineering and farm mechanics written in a readable style for the practical farmer . as beenfound well to lay a coating of tar or asphalt onthe foundation walls and on this put the sills,thus making an air-tight job. There must beno entrance of air underneath the ice. It istrue that a small amount will enter through thedrain if the latter is not trapped, but this is notsufficient to do any harm. In a commercialhouse of large size, however, the drain should beof tile and trapped as it comes from under theicehouse. Preferably, too, there is a drainaround the foundation on the outside, both ofthe drains being brought together and led awayto a lower level. The roof for a small building may be almostanything to shed the rain, keep off the sun, and 18 FARM ENGINEERING provide good ventilation. The latter featureis the one most important point in connec-tion with building the house. The ventilatorsshould be closeable and kept closed on foggydays and nights. For this reason trap-doorson the sides and roof are preferable. The roofthould be a V-shaped or hipped roof, with trap-. Fig. 7.—Simple roof ventilators for icehouse view shows a trap-door arrangement for the end walls,giving opportunity for proper ventilation doors at each end and at the ridge. Near thetop of each end wall arrange a small door. Eachfine, dry day open one of these doors and theopposite trap so that the air may circulate freelyand keep the top dressing or covering of saw-dust dry. This top dressing should not be toothick, the practice being to have it from eight totwelve inches. The dressing must be looked THE FARM ICEHOUSE 19 after and kept dry at any cost. It will befound helpful, although a nuisance, to dividethe top layer by a thick layer of newspaper. In packing, the first layer is commonly placedon edge rather than being laid flat. Thereis no less wasting that way, for, although eachcak
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