y be turned up ver- In winter, however, the conditions are very much changed. filed so that it w:ll not slip on the knob when attached as tically, so as not to be in the way of raising or lo ivering either For at least seven months in the year, in this latitude, an sash, and is retained in position… … it is being done. Under the conditions of winter ventila- the upper rail of the lower sash is a spring clamp or catch, tion, this can only be accomplished by a constant process of rubber strap passes around the shank of the door knob and D. This has a recess which, when the tongue, B, is turned…
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