he question to use either the dooror the section in the roof, I had a tin tubeplaced in the space below the glass. It ranfrom one corner to the middle of the build-ing, and there turned and ran up inside thecasing between the sash, and at the top ofthe casing it projected into the room abouttwo… … this cover partly off during the daytime;for the room concentrated the heat of thesun, and became too warm, making freshair desirable. At night it was kept closed,in cold weather. By placing the tubeinside the casing, with sand about it; thenleading it up to the roof, and then into theroom, the…
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