"With this construction there need be no fear of "trapping" the warm moist air back of monitor windows, which seems to worry some theorists" page 117
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Fowls do not sweat, they lose very little heat thru the skin because the feathers are almost perfect insulation. The urine of fowls contains very little moisture. The fowl gets rid of excess moisture and body heat thru the exhaled breath. If this moisture-laden air has an opportunity to condense on cold ceiling, walls or windows, instead of being carried off by good circulation of fresh-air thru an open front, it may be seen as dampness or frost.
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Thru many seasons I have carefully tested the circulation of air in Woods houses under different conditions, in calm weather, in driving rain and snow storms, and great gales, with the house empty, and with fowls working in litter, or at night with them at rest on the roost. Smoke was used to test the air currents in various parts of the house. During storms the average extreme penetration of the wind was tested, marking the point where it could be felt upon face or moistened finger. Always the actual penetration of either snow or rain was very much less, seldom more than a few inches back of the wire. In Fig. 53, the upper diagram shows end elevation of house and path of circulation of air indicated by arrows. It will be noted that the cold out-door air enters all along the open front except close up near roof, that it is deflected toward the floor and curves upward just past center of house. If no dropping board is used, it flows up above the roosts, curves toward the monitor and down under the low front roof passing out at top of open front. There are variations due to outside conditions and movement of fowls or attendant in the house, but the air current is fairly constant as shown. Where a dropping board is used the direction of air current is about the same except that the exchange of air under the board is slower, but by day is kept agitated by fowls constantly running in and out. Dropping board and air current below, shown in dotted lines. Of course, when monitor windows are opened there is a strong air current up and out thru these windows. This is not a draft. (See discussion of drafts in Chapter 1.)"
page 120
Diagram two posts down. I don't know how to get a picture onto the post from the main computer. I'll edit again if I can figure it out.... editing on the phone worked.
Adding second, semi-related picture, while I have them found.
